Hide and seek, vol. 1 (Viz Media)

Shuji, a divorced single dad running a modest corner shop, has an easy-going attitude and an eye out for anything to break the boredom of his days. So when Saji, the serious, reserved pediatrician who's been coming into his store, suddenly declares that he's gay and wants to take Shuji home, Shuji goes along with it out of simple curiosity. He thought they'd just mess around, have some fun, and that would be that. But he gets a lot more than he bargained for in this the story of opposites in love!