If you want, I can attempt a live search to see if this exact title exists on current platforms, or help reconstruct its likely story outline in even more narrative detail. Would you like that?
It sounds like you’re looking for a deep feature on the title (roughly: 240906 – The Summer a Boy Became an Adult, Vol. 1: Best ). 240906 shounen ga otona ni natta natsu vol1 best
The actress persona, Kiriru, is not treated as a separate entity or a supernatural possession. Instead, she is a psychological mask created by Reiko through scientific or deliberate planning. If you want, I can attempt a live
Ratings on DLsite for similar works are often 4–4.5 stars, with praise for art and “heartwarming ecchi” but criticism for short length. 1: Best )
BLCD, Drama CD Review, Coming-of-Age, Shounen ga Otona ni Natta Natsu, 240906
From similar works (e.g., Boku no Daisuki na Oba-san , Natsu no Saishuubi ):
The "Cool Big Sis" figure and chemical genius who stays in the shadows.