The Japanese distributor Getchu listed that the hentai doujinshi written and illustrated by Jairou, ‘Shounen ga Otona ni Natta Natsu,’ will have an animated adaptation, with the first episode premiering on September 6, 2024, in Japan.
While the production is being handled by Queen Bee, the original doujinshi is available in nhentai’s catalog (501787), and the synopsis reads:
The protagonist, Ryuki Kirishima, lost his parents in a car accident at a young age and lives with his older sister, Reiko. He feels that Reiko is the best person in the world. Ryuki meets in a warehouse of a secret base and watches a video of the supernova ‘Kiril-sama,’ which is the talk of adult video sites. She has large, soft breasts, a waist that can be described as perfect, and an overwhelmingly plump ass. Ryuki had never reacted to pornographic videos before, but Kiril was different. Kiril suddenly appears naked and creates an unforgettable summer memory.