The release schedule was as follows:
The story follows , a young football prodigy who has lived with his older sister, Reiko , since the loss of their parents. Reiko, a brilliant chemical genius, essentially raised him, but their lives take a strange turn one summer. -240906- Shounen ga Otona ni Natta Natsu Vol.1 ...
: Created by Jairou; Volume 1 collects the initial chapters of the 2022-2023 serialization. The release schedule was as follows: The story
Understanding that this comes from a Japanese media context, it's also worth considering the cultural nuances that might influence the story. Japan has a rich tradition of coming-of-age stories (known as "seishun manga" or "seinen manga" for older audiences), which often reflect societal expectations, personal growth, and the transition into adult roles. Understanding that this comes from a Japanese media
As this appears to be a niche or specific title, detailed plot points, character names, and author information would depend on the specific creative work behind the "-240906-" label.
Shounen ga Otona ni Natta Natsu (OVA 2024) - MyAnimeList.net
The OVA heavily leverages classic anime tropes—such as cicadas buzzing, humid afternoons, and isolated rural settings—to emphasize its nostalgic "end of youth" atmosphere.