Machigitsune to Hito no Ko

In 1920s Tokyo, prodigy Kiyo has finally made it to university, only to find himself in a tough spot. He happens upon Ozaki, who invites him to live in his mansion. But is Ozaki just an eccentric recluse, or something far stranger? And what kind of relationship did he have with Kiyo's grandfather?

(Source: Kodansha US)