After one heavy-drinking night, Kaji woke up to find his usually-cool same-year colleague Kamiya on top of him, only wore a shirt, and was shaking his hips quite hard. Moreover, when asked what he was up to, Kamiya simply said "I broke up with my sex friend so it's been accumulated." After that day, Kaji started to grow curious and attached to Kamiya?! An office romance at Touto Daiichi Bank between a divorced man and a hidden slut.