1x12 - School Babysitters

On a Sunday, Ryuichi heads out to hang out with his classmates, leaving Kotaro behind for the first time. Kotaro is sad about having to stay home with Saikawa, but things pick up when he finds the family library. Later, around Christmas, the kids are all waiting for Santa to come. Ryuichi wants to dress up as Santa to make Kotaro happy, but a few obstacles present themselves...