: Continues Ryuuki's "summer of growth," further developing the love triangle between Ryuuki, Kirill, and his childhood friend Chiaki. Where to Find The series was originally serialized in the adult magazine Comic MILF between 2022 and 2023. For digital versions: Manga Readers
Since it's a film and not a multi-episode series, I will provide information on the single movie: shounen ga otona ni natta natsu cap 1 2 3 sub fixed