Onigawara - sensei is the school's nurse. She is very close to Mio and enjoys dressing her up in cosplays and outfits and then rating them. She is also the club's supervisor and provides the room where all of the club activities take place. She doesn't talk much but does like to get involved in what ever is going on and often takes pictures of the girls.
Japanese Voice Actor- Rie Tanaka
English Voice Actor - Genevieve Simmons