: A young football prodigy and the protagonist who undergoes a significant "coming of age" journey during a pivotal summer.
The narrative takes a turn when Ryuuki encounters Kirill in person during the summer holidays. As the story progresses, it is revealed that Kirill is actually a persona created by his sister, Reiko—a chemical genius who developed this identity as an outlet for her repressed feelings. Episode Guide (1–3) shounen ga otona ni natta natsu cap 1 2 3 sub free
The series focuses on Ryuuki's transformation from boyhood to adulthood through his secret relationship with the "two" sisters. : A young football prodigy and the protagonist