In which mc gets dumped by his girlfriend and goes to a bar to drink his sorrows away (as does every other guy after they get dumped). At the bar, he meets a good looking guy who he names pretty-boy, and they have a one-night stand. Mc doesn't know who "pretty boy" is so he looks for him. One day, his sister divorces with her husband and asks mc to drop-off her son to his preschool(?). To his surprise, he meets pretty-boy there because he works at the school.
Orokamono ga Koi o Shitara.