diff --git a/.luacheckrc b/.luacheckrc
index 73a56b4..0f7d7aa 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -3,6 +3,7 @@
 
 globals = {
   "Focus",
+  "Day",
   "Util",
   "Decision",
   "Situation",
diff --git a/impostor.inc b/impostor.inc
index 4dd1c2c..8ebe699 100644
--- a/impostor.inc
+++ b/impostor.inc
@@ -8,6 +8,7 @@ system/system.util.lua
 system/system.print.lua
 system/system.input.lua
 system/system.focus.lua
+system/system.day.lua
 system/system.ui.lua
 audio/audio.manager.lua
 audio/audio.songs.lua
@@ -28,6 +29,7 @@ decision/decision.play_ddr.lua
 map/map.manager.lua
 map/map.bedroom.lua
 map/map.street.lua
+map/map.office.lua
 screen/screen.manager.lua
 screen/screen.home.lua
 screen/screen.toilet.lua
diff --git a/inc/audio/audio.manager.lua b/inc/audio/audio.manager.lua
index 583ffd2..2e9f0eb 100644
--- a/inc/audio/audio.manager.lua
+++ b/inc/audio/audio.manager.lua
@@ -19,7 +19,6 @@ function Audio.music_play_room_street_1() end
 --- @within Audio
 function Audio.music_play_room_street_2() end
 --- Plays room music.
--- TODO: function name is incomplete, determine the correct room identifier
 --- @within Audio
 function Audio.music_play_room_() end
 --- Plays room work music.
diff --git a/inc/init/init.context.lua b/inc/init/init.context.lua
index 62cf5bb..f45855a 100644
--- a/inc/init/init.context.lua
+++ b/inc/init/init.context.lua
@@ -37,7 +37,8 @@ function Context.initial_data()
     game = {
       current_screen = "home",
       current_situation = nil,
-    }
+    },
+    day_count = 1,
   }
 end
 
diff --git a/inc/init/init.meter.lua b/inc/init/init.meter.lua
index 31d1ef1..c904311 100644
--- a/inc/init/init.meter.lua
+++ b/inc/init/init.meter.lua
@@ -98,6 +98,7 @@ function Meter.update()
     end
     m.timer_progress = m.timer_progress + (1 / meter_timer_duration)
     if m.timer_progress >= 1 then
+      Day.increase()
       m.timer_progress = m.timer_progress - 1
       m.ism = math.max(0, m.ism - meter_timer_decay_per_revolution)
       m.wpm = math.max(0, m.wpm - meter_timer_decay_per_revolution)
diff --git a/inc/init/init.module.lua b/inc/init/init.module.lua
index 700caa5..50ea344 100644
--- a/inc/init/init.module.lua
+++ b/inc/init/init.module.lua
@@ -12,3 +12,4 @@ Input = {}
 Sprite = {}
 Audio = {}
 Focus = {}
+Day = {}
\ No newline at end of file
diff --git a/inc/map/map.office.lua b/inc/map/map.office.lua
new file mode 100644
index 0000000..42a7202
--- /dev/null
+++ b/inc/map/map.office.lua
@@ -0,0 +1,9 @@
+Map.register({
+  id = "office",
+  from_x =  60,
+  from_y =  0,
+  width  = 30,
+  height = 17,
+  to_x   =  0,
+  to_y   =  0,
+})
\ No newline at end of file
diff --git a/inc/screen/screen.home.lua b/inc/screen/screen.home.lua
index 49d2bda..a801ec1 100644
--- a/inc/screen/screen.home.lua
+++ b/inc/screen/screen.home.lua
@@ -5,5 +5,5 @@ Screen.register({
     "go_to_toilet",
     "go_to_walking_to_office",
   },
-  background = "bedroom",
+  background = "bedroom"
 })
diff --git a/inc/screen/screen.office.lua b/inc/screen/screen.office.lua
index 3d5320c..b7a0102 100644
--- a/inc/screen/screen.office.lua
+++ b/inc/screen/screen.office.lua
@@ -1,7 +1,6 @@
 Screen.register({
   id = "office",
   name = "Office",
-  background_color = Config.colors.dark_grey,
   decisions = {
     "play_button_mash",
     "play_rhythm",
@@ -12,4 +11,5 @@ Screen.register({
   situations = {
     "drink_coffee",
   },
+  background = "office"
 })
diff --git a/inc/screen/screen.toilet.lua b/inc/screen/screen.toilet.lua
index dae74c3..4ae2a8c 100644
--- a/inc/screen/screen.toilet.lua
+++ b/inc/screen/screen.toilet.lua
@@ -30,8 +30,7 @@ Screen.register({
     local bar_x = math.floor((sw - bar_w) / 2)
     local bar_h = 4
 
-    -- TODO: Add day counter
-    Print.text_center("day 1", cx, 10, Config.colors.white)
+    Print.text_center("day " .. Context.day_count, cx, 10, Config.colors.white)
 
     local narrative = "reflecting on my past and present\n...\nboth eventually flushed."
     local wrapped = UI.word_wrap(narrative, 38)
diff --git a/inc/system/system.day.lua b/inc/system/system.day.lua
new file mode 100644
index 0000000..8b03d01
--- /dev/null
+++ b/inc/system/system.day.lua
@@ -0,0 +1,11 @@
+local _day_increase_handlers = {}
+
+function Day.increase()
+    Context.day_count = Context.day_count + 1
+    for _, handler in ipairs(_day_increase_handlers) do
+        handler()
+    end
+end
+function Day.register_handler(handler)
+    table.insert(_day_increase_handlers, handler)
+end