Idou Seikou Kiatsu

Komoro Yachiyo is a college student like any other, or would be if not for her relationship with a married middle-aged man named Tsuchiya. The story follows her as she starts questioning her place in Tsuchiya's life, who sees her as an easy girl who he can use when its most convenient to him.
Yachiyo begins seeking love from her friend Aki amidst her doubts, adding more questions and complications to her already messy sexual life.