It's time for the Christmas party, an annual tradition at Hiiragi Apartments. Shiori continues to grow closer to Ichiro, but she also spends time with some of the other friends she's made since her arrival.

Wakana Gojo is a high school student who dreams of becoming a kashirashi for hina dolls one day. Because his life is all about making hina dolls, he has a hard time fitting into his class because his interests are so different than anyone else’s. His classmate, Marin Kitagawa, is always at the center of attention and from another world. One day, they both end up on classroom cleaning duty and…

After hearing each other’s true feelings at the school festival, Akane and Yamada have become closer than ever. Although Akane now had more confidence in how she felt about Yamada, somewhere in her heart she felt needed to hold herself back. With her thoughts in disarray, she finds out a new development was occurring in their FOS guild. It was decided a new female member would be added to the guild. Moreover, this was actually someone that Yamada was introducing to them. And she was also his classmate…

The rooftop trio meet with a mysterious person who says they have something important to say to the Bastions.