鍋島 立哉

Tatsuya was originally an aspiring painter training under Saki's mother but after accusations of plagarism, he was shaken to his core and ran away from the art world, becoming a social studies teacher instead. He currently has little motivation to produce artwork.He lives a simple, yet repetitive life - work, get food from the convenience store on his way home and then wash it down with alcohol in his bachelor pad.

Tatsuya is described as strict but kind by the heroines and is actually surprisingly popular with female students at the school.