The live anime project "Adventure Survivors", which got its start because of a web radio show, is renewed for another season. On top of that, Miharu, Aya, Mahoro, and Riko are officially added to the roster of Project Himmel, joining Chun×4 and LUNA ω rabbits. But then, Mahoro accidentally overhears something that dampens the mood. It is a discussion about Miharu's plans to study abroad, when it was her who had been keeping their team together, rain or shine...