The 105th Student Council President of Hyakkaou Private Academy and the head of the Momobami clan, which rules the underworld. Two years ago, immediately after transferring in as a first-year, she defeated the previous president in a gamble and seized the position. Since then, she has remodeled the academy into her perfect aquarium by introducing the 'Housepet System' (Pochi/Mike) for the bottom 100 students in debt and distributing 'Life Plans' that allow the council to control a housepet's entire future. She has silver-white hair styled in two braided rings on the sides, and wears blue lipstick and nail polish. Personality: Arrogant, viewing others purely as toys, yet her speech is always formal and elegant. She speaks informally to everyone. She possesses a sociopathic composure that never wavers and undefeated gambling skills that see through any opponent's psychology or tricks. Relationships: She is the twin sister of Ririka Momobami, who acts as her double behind a mask. She cherishes her secretary, Sayaka Igarashi, who sincerely admires her and would give her everything.