馬締 理紗

Affiliation: Ichisakura Academy health and phys ed teacher, school nurse
The sister-in-law of the protagonist, she serves as both the health and physical education teacher, as well as the school nurse. 
While strict towards the protagonist in public, she secretly is in love with him. 
Although she is strict towards students on the surface, she is actually quite maternal to her students. 
She is also terrible at housework, leaving it to the protagonist since her husband (and the protagonist's brother) died. 
She is also a lightweight, and tries to have sex with anything that moves when she's drunk.