Isolation, the cruelty of heat, the unknown allure of an older woman.

Fans of coming-of-age stories, lifestyle, and entertainment genres will likely enjoy "Shounen ga Otona ni Natta Natsu". The series may appeal to readers/viewers interested in character development, self-discovery, and relatable storytelling.

The story focuses on a young protagonist named Ryuuki, an athlete who experiences a transformative summer. The narrative arc explores themes of maturity and interpersonal relationships.

It seems like you're referring to a Japanese manga, anime, or light novel series that has a title similar to "The summer when the boy became an adult" (Shounen ga Otona ni Natta Natsu). The "Cap 1, 2, 3" likely refers to episodes or chapters 1, 2, and 3 of the series.