Unexpectedly, he crossed paths with his old high school friend, Yachiyo, during his grandmother's funeral. It had been two long years since they last saw each other, right after Yachiyo's wedding. Their friendship had become distant due to a past incident in high school.

"At that moment, I failed to comprehend the significance of it all, and by the time I did, it was already too late—a haunting memory. The emotions that I believed I had let go of resurfaced, engulfing me as we crossed paths once more..."

Note: Includes the one-shot "Ai da Nante Shiranai shi" and one extra chapter.