Extra Menu
Beat the game once and make a clear save. This will give you access to the Extra's menu in the main title screen. Every subsequent playthrough extra endings are added to the gallery, as well as Encyclopedia information.
The following information is unlocked once the game is cleared:
Gallery - Picture Gallery of all the characters and ending portraits based on your saved game.
Database - The Encyclopedia of Monsters, Alchemy Items, and Recipe
Music - The OST in game
Cast - Listen to the thanks of the Japanese voice cast
Endings - View all unlocked endings