In Amnesia World, the theme is "Parallel Worlds". You're able to choose different "worlds" to play in after the prologue: the "School World", in which you're a normal high school girl, the "Music World", in which you work for a music company, and the "Criminal World", in which you work at a detective agency. Alternatively you can stay in the "Normal World", which is set in the "original" Amnesia world. Each world has a different atmosphere and gameplay.