Natsumi Kuzuryu

Fuyuhiko's sister was the late younger sister of Fuyuhiko Kuzuryu. She was killed by a fellow student named Sato, who covered it up along with Mahiru Koizumi, blaming it on a serial pervert. Her death was avenged by Fuyuhiko, who in return killed Satou. This accident revealed in the Danganronpa 2: Goodbye Despair second motive, Twilight Syndrome Murder Mystery. In one of Fuyuhiko's free time events, it's revealed that his sister's title was the “ Ultimate Little Sister ”.

Appearance
In Twilight Syndrome Murder Mystery, Fuyuhiko's sister has a long blonde hair and wears Hope's Peak Academy uniform.

Personality
In Twilight Syndrome Murder Mystery and according to E-ko, Fuyuhiko's sister described as a mean and egoist girl who will plant hatred towards someone she dislikes or envy.

Fuyuhiko Kuzuryu
Fuyuhiko is her older brother. She and Fuyuhiko both care about each other, as evident by Fuyuhiko taking revenge on her by killing her murderer in the same fashion. She got her talent “Ultimate Little Sister” because of her brother's influence as a Yakuza.