Satou-sensei no Furin Jijou

A whirlpool of work and lust is swirling in the small walled garden known as "school"... Shino Satou is serious, straight-laced 30-year-old woman who works as a teacher. Both of her parents are teachers, and her husband - whom her parents arranged for her to marry - is also a teacher. A prim and proper person, she had always walked the straight and narrow path in life... until the day she witnessed her husband having an extramarital affair. In the midst of her resulting grief, a teacher who works at her school extends a helping hand to her... by tempting her into having a simultaneous affair with him?! Source: Shogakukan