Note: The series deals with adult themes and is intended for mature audiences.
Shounen ga Otona ni Natta Natsu (The Summer a Boy Became an Adult) is an adult-oriented manga (Hentai) created by the author -240906- Shounen ga Otona ni Natta Natsu Vol.1 ...
I notice the string you provided ( -240906- Shounen ga Otona ni Natta Natsu Vol.1 ... ) resembles a catalog or product code, possibly for a manga, light novel, or doujinshi volume. However, I don’t have access to specific commercial or unpublished databases, nor can I verify the content of unreleased or niche volumes. Note: The series deals with adult themes and