As the summer drew to a close, Masashi reflected on the journey he had been on. He realized that becoming an adult wasn't just about physical changes, but about emotional and psychological growth as well.

A famous adult film actress who mysteriously enters Ryuuki's life.

Most coming-of-age stories treat adulthood as a goal—a triumphant graduation. This work treats it as Haruto doesn’t have a dramatic epiphany; he simply notices one evening that Saki’s shoulders look tired, that the river seems smaller, that his grandmother moves more slowly. The “summer a boy became an adult” isn’t marked by a heroic act or a first kiss (though there are tender moments). It’s marked by his ability to see loss —to realize that growing up means accepting that some things end without closure.