diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..b35845c
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "game/lib/Concord"]
+	path = game/lib/Concord
+	url = https://github.com/Keyslam-Group/Concord
+[submodule "game/lib/classic"]
+	path = game/lib/classic
+	url = https://github.com/rxi/classic/
diff --git a/game/asset/audio/bgm/Ensemble.mp3 b/game/asset/audio/bgm/Ensemble.mp3
new file mode 100644
index 0000000..8fd8ec0
Binary files /dev/null and b/game/asset/audio/bgm/Ensemble.mp3 differ
diff --git a/game/lib/reap/init.lua b/game/lib/reap/init.lua
new file mode 100644
index 0000000..74ed535
--- /dev/null
+++ b/game/lib/reap/init.lua
@@ -0,0 +1,33 @@
+local reap = {}
+
+--- given lua require file path, return the base in lua path notation
+--- usage example :
+--- ``local BASE_PATH = reap.base_path(...)``
+---@param path string ex: lib.reap.test
+---@return string base_path ex: lib.reap
+---@return number replacement_count ex: 1
+function reap.base_path(path)
+  return path:gsub('%.[^%.]+$', '')
+end
+
+--- given lua require file path, return the base in directory notation
+--- usage example :
+--- ``local BASE_DIR = reap.base_dir(...)``
+---@param path string ex: lib.reap.test
+---@return string base_dir ex: lib/reap
+---@return number replacement_count ex: 1
+function reap.base_dir(path)
+  return reap.base_path(path):gsub("[.]", "/")
+end
+
+--- given lua require file path, return in directory notation
+--- usage example :
+--- ``local DIR = reap.dir(...)``
+---@param path string ex: lib.reap.test
+---@return string lua_dir ex: lib/reap/test
+---@return number replacement_count ex: 1
+function reap.dir(path)
+  return path:gsub("[.]", "/")
+end
+
+return reap
diff --git a/game/lib/reoof/cache.lua b/game/lib/reoof/cache.lua
new file mode 100644
index 0000000..880bc3d
--- /dev/null
+++ b/game/lib/reoof/cache.lua
@@ -0,0 +1,112 @@
+local format = string.format
+
+local classic = require("lib.classic.classic")
+
+---@class Cache : lib.classic.class
+---@field private fn function
+---@field cache table
+---@field count integer
+---@field name string
+local cache = classic:extend()
+cache._VERSION = "0.0.0-alpha"
+cache._DESCRIPTION = "A simple and straightforward cache made for LÖVE."
+cache._URL = "https://github.com/FNicon/reoof"
+cache._LICENSE = [[
+  MIT License
+
+  Copyright (c) 2025 FNicon
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+]]
+
+local function default_empty()
+end
+
+--- create entity
+---@param fn? function lambda to load resource
+---@param name? string for debug purposes
+-- ---@return Cache self
+function cache:new(fn, name)
+  -- local self = setmetatable({}, cache)
+  self.fn = fn or default_empty
+  self.cache = {}
+  self.count = 0
+  self.name = name or "cache"
+end
+
+--- load resource to cache
+---@param self Cache
+---@param key string assigned_key
+---@param ... any
+---@return any resource
+function cache:load_to(key, ...)
+  if (self.cache[key] == nil) then
+    self.cache[key] = self.fn(...)
+    self.count = self.count + 1
+    return self.cache[key]
+  else
+    return self:load_from(key)
+  end
+end
+
+
+--- load resource from cache
+---@param self Cache
+---@param key string assigned_key
+---@return any resource
+function cache:load_from(key)
+  if (self.cache[key] == nil) then
+    print(format("WARNING : key %s not found"), key)
+  else
+    return self.cache[key]
+  end
+end
+
+--- release object and set it up to nil
+---@param self Cache
+function cache:release()
+  for k, _ in pairs(self.cache) do
+    self:release(k)
+  end
+  self.cache = nil
+  self.count = nil
+  self.name = nil
+  self.fn = nil
+  setmetatable(self, nil)
+  self = nil
+end
+
+--- release object and set it up to nil
+---@param self Cache
+---@param key string
+function cache:release_from(key)
+  if (self.cache[key]) then
+    if (self.cache[key].release) then
+      self.cache[key]:release()
+      self.cache[key] = nil
+      self.count = self.count - 1
+    else
+      print(format("WARNING : during release, %s don't have release function"), key)
+    end
+  else
+    error(format("ERROR : during release, %s not found", key))
+  end
+end
+
+return cache
diff --git a/game/lib/reoof/pool.lua b/game/lib/reoof/pool.lua
new file mode 100644
index 0000000..85dab21
--- /dev/null
+++ b/game/lib/reoof/pool.lua
@@ -0,0 +1,194 @@
+local insert = table.insert
+local remove = table.remove
+
+local classic = require("lib.classic.classic")
+
+
+---@class Pool : lib.classic.class
+---@field private fn function
+---@field private rfn function
+---@field private efn function
+---@field active any[]
+---@field hidden any[]
+---@field max number | nil
+---@field name string
+local pool = classic:extend()
+pool._VERSION = "0.0.0-alpha"
+pool._DESCRIPTION = "A simple and straightforward pool made for LÖVE."
+pool._URL = "https://github.com/FNicon/reoof"
+pool._LICENSE = [[
+  MIT License
+
+  Copyright (c) 2025 FNicon
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+]]
+
+--- default equal function
+---@param v1 any
+---@param v2 any
+local function defaultEqual(v1, v2)
+  return v1 == v2
+end
+
+--- Return the first index with the given value (or nil if not found).
+---@param array any[]
+---@param value any
+---@param efn fun(...):boolean
+---@return number?
+local function indexOf(array, value, efn)
+  for i, v in pairs(array) do
+    if efn(v, value) then
+      return i
+    end
+  end
+  return nil
+end
+
+--- initialize pool
+---@param fn fun(...):any generate Function
+---@param rfn fun(...):any reset Function
+---@param name? string for debug purposes
+---@param max? number pool max size
+---@param efn? fun(...):boolean equal Function
+---@return Pool self
+function pool:new(fn, rfn, name, max, efn)
+  -- local self = setmetatable({}, pool)
+  self.active = {}
+  self.hidden = {}
+  self.fn = fn
+  self.rfn = rfn
+  self.efn = efn or defaultEqual
+  self.max = max > 0 and max or nil
+  self.name = name or "pool"
+  return self
+end
+
+--- put entity to pool
+---@param self Pool
+---@param entity any
+---@return Pool
+---@return number hidden_idx index from hidden pool
+function pool:put(entity)
+  local idx = indexOf(self.active, entity, self.efn)
+  if (idx) then
+    self:put_to(entity, idx)
+    return self, #self.hidden
+  else
+    print("WARNING : trying to insert entity not from generate function")
+    return self, -1
+  end
+end
+
+--- put entity to pool
+---@param self Pool
+---@param entity any
+---@param idx number
+---@return Pool
+---@return number hidden_idx index from hidden pool
+function pool:put_to(entity, idx)
+  if (self.max) then
+    if (#self.hidden < self.max) then
+      insert(self.hidden, entity)
+    else
+      self:release(entity)
+    end
+  else
+    insert(self.hidden, entity)
+  end
+  remove(self.active, idx)
+  return self, #self.hidden
+end
+
+--- get entity from pool
+---@param self Pool
+---@param ... any
+---@return any entity from pool
+---@return number active_idx
+function pool:get(...)
+  local entity = self.hidden[#self.hidden]
+  if (entity) then
+    insert(self.active, entity)
+    remove(self.hidden, #self.hidden)
+    self.rfn(entity, ...)
+    return entity, #self.active
+  else
+    entity = self.fn(...)
+    insert(self.active, entity)
+    return entity, #self.active
+  end
+end
+
+--- release function
+---@param self Pool
+---@param entity? any
+function pool:release(entity)
+  if (entity == nil) then
+    for _, v in pairs(self.active) do
+      self:release(v)
+    end
+    for _, v in pairs(self.hidden) do
+      self:release(v)
+    end
+    self.active = nil
+    self.hidden = nil
+    self.fn = nil
+    self.rfn = nil
+    self.efn = nil
+    self.name = nil
+    setmetatable(self, nil)
+    self = nil
+  else
+    local idx = indexOf(self.active, entity, self.efn)
+    if (idx) then
+      self:release_from("active", idx)
+    else
+      idx = indexOf(self.hidden, entity, self.efn)
+      if (idx) then
+        self:release_from("hidden", idx)
+      else
+        print("WARNING : trying to release object not from generate function")
+      end
+    end
+  end
+end
+
+--- release function
+---@param self Pool
+---@param from_pool "hidden" | "active"
+---@param idx number
+function pool:release_from(from_pool, idx)
+  if (from_pool == "hidden") then
+    if (self.hidden[idx].release) then
+      self.hidden[idx]:release()
+      remove(self.hidden, idx)
+    else
+      print("WARNING : during release hidden, %d don't have release function", idx)
+    end
+  else
+    if (self.active[idx].release) then
+      self.active[idx]:release()
+      remove(self.active, idx)
+    else
+      print("WARNING : during release active, %d don't have release function", idx)
+    end
+  end
+end
+
+return pool
diff --git a/game/main.lua b/game/main.lua
index a1a5d59..77330d2 100644
--- a/game/main.lua
+++ b/game/main.lua
@@ -6,9 +6,14 @@ local mode = {
 local actor = require("src.entities.shared.actor")
 local player = actor.load("player")
 
+local source_cls = require("wrapper.lappy.new.source")
+local source = source_cls.obj
+
 local mode_i = 1
 
 function love.load()
+  source:load_to("asset/audio/bgm/Ensemble.mp3", "asset/audio/bgm/Ensemble.mp3", "stream")
+  source:load_from("asset/audio/bgm/Ensemble.mp3"):play()
   mode[mode_i].load(player)
 end
 
diff --git a/game/wrapper/Concord/world.lua b/game/wrapper/Concord/world.lua
new file mode 100644
index 0000000..e70231d
--- /dev/null
+++ b/game/wrapper/Concord/world.lua
@@ -0,0 +1,142 @@
+local format = string.format
+
+local reap = require("libs.reap")
+
+local BASE = reap.base_path(...)
+local component_builder = require(format("%s.component", BASE))
+local entity_builder = require(format("%s.entity", BASE))
+
+local Concord = require("libs.Concord")
+
+-- Modules
+local Entity     = Concord.entity
+local Component  = Concord.component
+local System     = Concord.system
+local World      = Concord.world
+
+local main_wrapper = require "wrapper.lappy.world"
+---@class wrappers.Concord.world : lappy.world
+local wrapper = main_wrapper:extend()
+
+function wrapper:new(path, name)
+  wrapper.super.new(self, path, name)
+  self.world = World()
+end
+
+local function load_systems(world, system_paths)
+  for _, p in pairs(system_paths) do
+    local Systems = {}
+    Concord.utils.loadNamespace(p, Systems)
+    for k, s in pairs(Systems) do
+      for c, l in pairs(s.components) do
+        if (type(c) == "number") then
+          component_builder.state(l)
+        else
+          component_builder.component(c, l)
+        end
+      end
+      local new_s = s.new()
+      if (new_s) then
+        world:addSystem(
+          new_s
+        )
+      end
+    end
+  end
+end
+
+local function load_entities(world, data)
+  for _, d in pairs(data) do
+    local entity = entity_builder.new()
+    entity:assemble(d.assemblage, d.data)
+    world:addEntity(entity)
+  end
+end
+
+function wrapper:load(system_paths, entities_data)
+  load_systems(self.world, system_paths)
+  load_entities(self.world, entities_data)
+  self.world:emit("load")
+end
+
+function wrapper:draw()
+  self.world:emit("draw")
+end
+
+function wrapper:update(dt)
+  self.world:emit("update", dt)
+end
+
+-- mouse
+
+function wrapper:mousemoved( x, y, dx, dy, istouch)
+  self.world:emit("mousemoved", x, y, dx, dy, istouch)
+end
+
+function wrapper:mousepressed(x, y, button, istouch, presses)
+  self.world:emit("mousepressed", x, y, button, istouch, presses)
+end
+
+function wrapper:mousereleased(x, y, button, istouch, presses)
+  self.world:emit("mousereleased", x, y, button, istouch, presses)
+end
+
+function wrapper:wheelmoved(x, y)
+  self.world:emit("wheelmoved", x, y)
+end
+
+-- keyboard
+
+function wrapper:keypressed(key, scancode, isrepeat)
+  self.world:emit("keypressed", key, scancode, isrepeat)
+end
+
+function wrapper:keyreleased(key, scancode)
+  self.world:emit("keyreleased", key, scancode)
+end
+
+-- touchscreen
+
+function wrapper:touchpressed(id, x, y, dx, dy, pressure)
+  self.world:emit("touchpressed", id, x, y, dx, dy, pressure)
+end
+
+function wrapper:textinput(t)
+  self.world:emit("textinput", t)
+end
+
+function wrapper:resize(w,h)
+  self.world:emit("rezise", w, h)
+end
+
+function wrapper:focus(f)
+  self.world:emit("focus", f)
+end
+
+function wrapper:quit()
+  self.world:emit("quit")
+end
+
+-- for gamepad support also add the following:
+
+function wrapper:joystickadded(joystick)
+  self.world:emit("joystickadded", joystick)
+end
+
+function wrapper:joystickremoved(joystick)
+  self.world:emit("joystickremoved", joystick)
+end
+
+function wrapper:gamepadpressed(joystick, button)
+  self.world:emit("gamepadpressed", joystick, button)
+end
+
+function wrapper:gamepadreleased(joystick, button)
+  self.world:emit("gamepadreleased", joystick, button)
+end
+
+function wrapper:gamepadaxis(joystick, axis, value)
+  self.world:emit("gamepadaxis", joystick, axis, value)
+end
+
+return wrapper
diff --git a/game/wrapper/lappy/new/image.lua b/game/wrapper/lappy/new/image.lua
new file mode 100644
index 0000000..ef94c68
--- /dev/null
+++ b/game/wrapper/lappy/new/image.lua
@@ -0,0 +1,17 @@
+local cache = require("lib.reoof.cache")
+---@class lappy.image : Cache
+---@field cache any
+local _cache = cache:extend()
+
+--- new function
+function _cache:new()
+  _cache.super.new(self, love.graphics.newImage, ".image")
+  self.cache = {}
+end
+
+local obj = _cache()
+
+return {
+  class = _cache,
+  obj = obj
+}
diff --git a/game/wrapper/lappy/new/image_data.lua b/game/wrapper/lappy/new/image_data.lua
new file mode 100644
index 0000000..cb8c8bb
--- /dev/null
+++ b/game/wrapper/lappy/new/image_data.lua
@@ -0,0 +1,17 @@
+local cache = require("lib.reoof.cache")
+---@class lappy.image_data : Cache
+---@field cache any
+local _cache = cache:extend()
+
+--- new function
+function _cache:new()
+  _cache.super.new(self, love.image.newImageData, ".image_data")
+  self.cache = {}
+end
+
+local obj = _cache()
+
+return {
+  class = _cache,
+  obj = obj
+}
diff --git a/game/wrapper/lappy/new/image_font.lua b/game/wrapper/lappy/new/image_font.lua
new file mode 100644
index 0000000..fa116f1
--- /dev/null
+++ b/game/wrapper/lappy/new/image_font.lua
@@ -0,0 +1,17 @@
+local cache = require("lib.reoof.cache")
+---@class lappy.image_font : Cache
+---@field cache any
+local _cache = cache:extend()
+
+--- new function
+function _cache:new()
+  _cache.super.new(self, love.graphics.newImageFont, ".image_font")
+  self.cache = {}
+end
+
+local obj = _cache()
+
+return {
+  class = _cache,
+  obj = obj
+}
diff --git a/game/wrapper/lappy/new/quad.lua b/game/wrapper/lappy/new/quad.lua
new file mode 100644
index 0000000..41809c6
--- /dev/null
+++ b/game/wrapper/lappy/new/quad.lua
@@ -0,0 +1,17 @@
+local cache = require("lib.reoof.cache")
+---@class lappy.quad : Cache
+---@field cache any
+local _cache = cache:extend()
+
+--- new function
+function _cache:new()
+  _cache.super.new(self, love.image.newQuad, ".quad")
+  self.cache = {}
+end
+
+local obj = _cache()
+
+return {
+  class = _cache,
+  obj = obj
+}
diff --git a/game/wrapper/lappy/new/source.lua b/game/wrapper/lappy/new/source.lua
new file mode 100644
index 0000000..b2457ee
--- /dev/null
+++ b/game/wrapper/lappy/new/source.lua
@@ -0,0 +1,17 @@
+local cache = require("lib.reoof.cache")
+---@class lappy.source : Cache
+---@field cache any
+local _cache = cache:extend()
+
+--- new function
+function _cache:new()
+  _cache.super.new(self, love.audio.newSource, ".source")
+  self.cache = {}
+end
+
+local obj = _cache()
+
+return {
+  class = _cache,
+  obj = obj
+}
diff --git a/game/wrapper/lappy/new/sprite_batch.lua b/game/wrapper/lappy/new/sprite_batch.lua
new file mode 100644
index 0000000..373de42
--- /dev/null
+++ b/game/wrapper/lappy/new/sprite_batch.lua
@@ -0,0 +1,17 @@
+local cache = require("lib.reoof.cache")
+---@class lappy.sprite_batch : Cache
+---@field cache any
+local _cache = cache:extend()
+
+--- new function
+function _cache:new()
+  _cache.super.new(self, love.graphics.newSpriteBatch, ".batch")
+  self.cache = {}
+end
+
+local obj = _cache()
+
+return {
+  class = _cache,
+  obj = obj
+}
diff --git a/game/wrapper/lappy/world.lua b/game/wrapper/lappy/world.lua
new file mode 100644
index 0000000..9958eb1
--- /dev/null
+++ b/game/wrapper/lappy/world.lua
@@ -0,0 +1,79 @@
+local classic = require "lib.classic"
+---@class lappy.world : lib.classic.class
+local wrapper = classic:extend()
+
+function wrapper:new(path, name)
+  self.path = path
+  self.name = name
+end
+
+function wrapper:load(_args)
+end
+
+function wrapper:draw()
+end
+
+function wrapper:update(dt)
+end
+
+-- mouse
+
+function wrapper:mousemoved( x, y, dx, dy, istouch)
+end
+
+function wrapper:mousepressed(x, y, button, istouch, presses)
+end
+
+function wrapper:mousereleased(x, y, button, istouch, presses)
+end
+
+function wrapper:wheelmoved(x, y)
+end
+
+-- keyboard
+
+function wrapper:keypressed(key, scancode, isrepeat)
+end
+
+function wrapper:keyreleased(key, scancode)
+end
+
+-- touchscreen
+
+function wrapper:touchpressed(id, x, y, dx, dy, pressure)
+end
+
+function wrapper:textinput(t)
+end
+
+function wrapper:resize(w,h)
+end
+
+function wrapper:focus(f)
+end
+
+function wrapper:quit()
+end
+
+-- for gamepad support also add the following:
+
+function wrapper:joystickadded(joystick)
+end
+
+function wrapper:joystickremoved(joystick)
+end
+
+function wrapper:gamepadpressed(joystick, button)
+end
+
+function wrapper:gamepadreleased(joystick, button)
+end
+
+function wrapper:gamepadaxis(joystick, axis, value)
+end
+
+function wrapper:__tostring()
+  return string.format("%s.%s", self.path, self.name)
+end
+
+return wrapper