Buried in the blooming flowers, young men and women struck their hearts. The man is Ryosuke Koshika, 22 years old. The woman is Akiko Kamiya, 21 years old. I can't go my way until I know what's wrong with my sister's heart.... Akiko's sister, Natsuko, approaches Ryosuke, who dropped out of high school and survived with his life intact, to find out the cause of his suicide.