Rika Tsuwabuki is one of Keita's sisters who has a long, black hair.
Rika Tsuwabuki is created by Yoshiaki Sukeno as the supporting characters in the Binbogami Ga! manga series. She has no information regarding any inspiration used by Yoshiaki Sukeno for her creation. She makes her first manga debut in volume 1: chapter 2 and first anime debut in episode 3. She is voiced by Shiho Kawaragi.
She is a seventh grader who usually wears her school, sailor uniform at home.
She's a respectful and modest girl who wants her siblings to act respectful to their guests.