Silent Sky is a combination of the additional episodes 13 and 14. It consists of the story in the future, three months after the incident that was similar to New Generation Madness and the disease Chaos Child Syndrome that brought by the past earthquake in Shibuya.

Chitose is an 11-year-old girl who is madly in love with an older guy named Hiroshi. He works at the town hall right next to the school and Chitose spends every day relentlessly pursuing him. Can Chitose ever convince Hiroshi to go out with her?

Unaired anime bundled with the limited edition of the 9th volume of the manga.

Virtual Reality and the arrival of Circlet Technology has changed people's lives. A new competitive electronic sport called Circlet Bout emerges, and schools duel to determine the strongest Circlet Bout Club and player. One day, Yuuka Sasaki gets mistaken for a challenger and battles against Chikage Fujimura, the best player in Japan, tying the intense fight despite her inexperience. These events lead to her passion for the sport, deciding to become a Circlet Bout player. Two years later, Yuuka moves to Tokyo and enrolls in Union School, a place where she can practice and pursue her dream of fighting Chikage again. After her arrival at the Union School, she discovers the club closed. Now her first goal is to help the athletic Miyuki Kasahara and club manager Ayumu Aizawa reopen Union's Circle Bout Club and return it to its former glory.