|Title||Ultimate Little Sister|
|Appearances||Danganronpa 2: Goodbye Despair|
Fuyuhiko's Sister was a character in the game Danganronpa 2: Goodbye Despair, she was murdered by Satou, a fellow student. Her title, as given by her older brother, was "Ultimate Little Sister". She is the late younger sibling of Fuyuhiko Kuzuryuu, who killed his sister's killer.
Prior to the events of Danganronpa 2: Goodbye Despair, she was knocked unconscious by Satou. Frightened of the consequences of her waking up, she killed her. Mahiru Koizumi was friends with Satou and bullied by Fuyuhiko's sister & found out the truth, but chose to be involved with the cover up of Fuyuhiko's sister's death, saying it was a pervert who killed her.