Otona Ni Natta Natsu Vol.1 ... | -240906- Shounen Ga

The franchise spans multiple media formats, with Volume 1 establishing the foundation of the series:

In a surreal turn of events, Ryuki encounters Kirill in person at an abandoned location, setting off a secret story involving the boy and two older sister figures. -240906- Shounen ga Otona ni Natta Natsu Vol.1 ...

Following the release of Volume 1 on September 6, the series continued with subsequent episodes: The franchise spans multiple media formats, with Volume