Nishinomiya Reina

The math teacher at Ryokufuuin Academy, and Satoshi's homeroom teacher. Despite her lazy, apathetic and daydreamy vibe, she's a genius researcher. She's childhood friends with Satoshi's mother, Youko, who she looks up to. Because of that, she often visits their house for a chat and a hearty dinner. However she may be, she looks out for Satoshi in the school.