Lonely Castle in the Mirror manga volume 3 features story by Mizuki Tsujimura and art by Tomo Taketomi.

The kids realize that, aside from Rion, they are all students at Yukishina Junior High No. 5. After an eventful Christmas party, Masamune plucks up his courage to suggest that the kids help each other out with their problems and maybe even start attending classes again. They all agree to go to school on January 10th. Will Kokoro finally be able to face her bullies?