"It's a symbol that I'm Chigira-kun's girlfriend." Maaya promised to be by Chigira-kun's side forever after receiving a ring from him on her birthday, which they spent alone together. Because she's always receiving happiness from Chigira-kun, Maaya is worried about how to return the same happiness to him. So, she comes up with the idea of inviting Tezuka-kun to the Christmas party being held at the Chigira home. This is a Christmas story that continues late into the night!!