SORA-420 Maina-chan living in the countryside. I wonder what happened to that very submissive girl lately? A true little weirdo who gets carried away with outdoor antics and ends up completely flustered. Shiki Maina

A passing summer day, a fading rural landscape, and the long yet brief three years of high school girlhood. Tochigi, a land surrounded by mountains and rivers. An energetic summer that slipped by in an instant. The original countryside scenery, gradually disappearing year by year due to urban development and other changes. Youthful and sensitive days are lived in a hurry.

And yet, in a place like this, still wrapped in nostalgia, she notices something unusual in her own desires and does not know what to do. Without even being able to tell whether it is right or wrong, she drifts into aimless intimacy. In her final summer, something like a single ray of light appears, something she can tell no one about. What does it mean to her? Only she knows the answer.