The story centers on , a young football prodigy living with his older sister, Reiko , after the tragic death of their parents. Reiko, a brilliant 27-year-old chemist, has essentially raised Ryuuki, creating a deep bond between them. Although he appears to be an average boy interested in school clubs and games, Ryuuki harbors a secret affection for his sister that goes beyond familial love.
The relationships deepen as boundaries blur during the peak of the summer heat, shifting from curiosity to explicit intimacy. shounen ga otona ni natta natsu cap 1 2 3 sub extra quality