おしおき生意気ギャル ～エロいオシオキをしたら自分からエッチを求めてきた～

The protagonist, Kawamura Yukihiro, welcomes his 20th year working as a janitor at a certain traditional school. But recently, a schoolgirl called Natsuki Rino, with a flashy appearance inappropriate for a school, often comes by to berate him and his work, which caused him distress.

At first, Yukihiro simply endures her antics, but as Rino's actions escalated, he can't bear to turn a blind eye anymore. One day, Rino finally resorted to physical abuse towards Yukihiro, which filled his heart with rage. Bearing the resolve to get fired from his job, Yukihiro decided to punish Rino in an "adult manner".