Yamada to Shounen

On the way home from work on Christmas Eve, 26-year-old blue-collar worker Yamada stumbles upon a drunk and crying high school boy and takes him in for the night. This boy, Chihiro, is polite, a good housekeeper, and lives quite close by, so he ends up coming over to Yamada's place from time-to-time to cook for him as thanks for the rescue. Yamada finds out later that the reason Chihiro was so miserable on the day they first met is because he was mulling over being in love with his best friend...