Kanna Seto lost her childhood friend Haruta in a car accident when she was a freshman in high school. Carrying the emotional pain from that incident throughout her life, Kanna is still wounded as an adult. Kanna then meets Roku Akazawa, who also carries a painful experience from his past. When Roku was an elementary school student, a girl who was with him got into an accident and died. Because of that incident, Roku carries a heavy sense of guilt. When they meet, time, frozen since that day, begins to tick again.

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