World of the Taiikukan.

Ayame Otsuka, who lives in Shimomura, Kanagawa, surrounded by beautiful trees, attends Kitaashigara High School in the mountains on a daily bus, and will soon be graduating. Ayame, who has stepped into the gymnasium where the graduation ceremony is being held, sees a different landscape that iss different from the usual gymnasium. A short spin-off of "Itsukano, Genkantachi to"