Kitagawa, a lawyer who lost his wife, temporarily closes his office to raise his young son, Sakutaro, and works as a part-time university lecturer.

Feeling the limits of raising a child alone, he meets Keisuke, a student at the university where he lectures, and hires him as a babysitter.

Kitagawa finds himself increasingly drawn to Keisuke, who brightens up the atmosphere with his unique cheerfulness and diligently takes care of Sakutaro.