Start a new game for the first time
Finish all routes
Use the glossary
Play the game with all glossary entries having been read
Play the game with popup messages turned off
Use the quick jump feature 10 times
Hide the text box once while playing the game
Try out all available window resolutions
Listen until the end of Yukishiro George's first speech
Listen until the end of Yukishiro George's second speech
Listen to one full loop of theme song on the title screen
Play the game for over 24 hours
Start a new game after clearing a route
Finish May's route
Finish Suguri's route
Finish Natsume's route
Finish Koharu's route
Unlock additional choices
Play the game after changing both auto-mode speed and minimum wait time
Play the game with all save slots used
Quick-save more than 10 times
Clear the minigame
Unlock all achievements