Rumika Aina

Rumika Aina serves as both a Modern Japanese Language teacher and the homeroom instructor for the protagonist's class at Ōzakura Girls' Academy. Now in her thirties and single, she signed up for a gym membership after noticing subtle changes in her figure. Cheerful and straightforward by nature, she has a habit of blurting out whatever crosses her mind, occasionally landing herself in awkward situations. Though she once lived the life of a delinquent in her youth, she has since reinvented herself as a dedicated educator—while secretly nursing a passion for cosplay that she keeps well hidden. Her closest companion is fellow teacher and drinking buddy Satomi Tachibana, with whom she regularly unwinds after work.