Lonely Heart

Yuki Keisuke, who just graduated from university this spring with the worst grades, for some reason started a self-proclaimed 'detective agency'. However, he doesn't get any cases. Then one day, his junior, Ryuta, brings him a case of a female university student's suicide. As Keisuke investigates, he senses another big incident hidden behind the case...

[Translated from gamepres.org]