Synopsis

The story centers on Riko, a girl who has never experienced love, and Minato, her childhood friend who serves on the school library committee. The two one day accidentally discover a novel written by a graduate from 30 years earlier. Inside its pages is a chilling confession: “I killed someone with my own hands.”
Using the clues hidden within the novel, Riko and Minato begin unraveling the mystery. As their investigation deepens, they gradually come to realize feelings within themselves that they had never acknowledged before.