After getting caught up in the chase with Momo, the young boy named as Hibiya Amamiya spends time with his friend, Hiyori Asahina, who he has a crush on. However, his plans to spend the summer with Hiyori is hindered by both her cold attitude towards him and her smitten behaviour towards the strange resident, Konoha. The following day, on August 15, Hibiya finds himself in what appears to be a dream in which Hiyori is hit by a truck while chasing after a black cat, whispering something before she is hit...