Houkago☆Lesson ~Yamitsuki! Futari no Ecchi na Kagai Jugyou~

Seiji is a rookie teacher. But there is his ex-girlfriend, Mizuka, at his school. They are surprised to meet again...., but it doesn't take long until they fall in love again. They meet secretly after school, but one day, Midori, a school counselor, finds out their relationship....