The OVA is broken down into two stories. The first story involves Shötarö's younger sister Moa having a crush on an older college guy, and asking him to the movies. Shötarö and Yūya follow them on their "date", but Shötarö gets the wrong idea in the end. It turns out unknowingly to Moa that the person she had a crush on is a female who had no bad intentions in mind. Moa is touched by her brother's kindness but calls him "Baldy" to save face. The second story takes place during Christmas where Shötarö, Moa, Yukina, Ayaka, and Neko all have a Christmas party over at Mitsuki's house...