Kesshite Iroaseru Koto no Nai Natsu no Hibi ni Boku wa Akiramekirenai Koi wo Shita

Natsushi Aoi has harbored feelings for someone since childhood but never expressed them. The object of his affection is a woman nearly ten years his senior, someone he has known since he was young and now lives with. She is also his brother Yo’s girlfriend, making his emotions difficult to navigate. As time moves forward, Natsushi is left with a painful realization: "Why did you have to die, Yo-nii..." The summer when the three of them were together and happy is gone. That particular summer will not return, but new summers will continue to come. One summer, in particular, will remain unforgettable for Natsushi.