Inu mo Kuwanai

Utsugi is an investigator working for a detective agency. When he's asked to track the wife of a college professor, Yamashiro, he discovers that she's cheating on him with another professor from the same university named Okuzono Shuji.

This isn't the first time this has happened: Okuzono has stolen away the women Yamashiro loves countless times before. These intellectuals are embroiled in a twisted and convoluted relationship, and now this young investigator finds himself thrown into the mix.