Summer, 1998. Fifteen-year-old Mei Misaki has traveled with her family to their seaside vacation home. There, she encounters the ghost of Teruya Sakaki, her classmate from Class 3-3 at Yomiyama North Middle School, who, like Mei, witnessed the mysterious events that occurred at the school. Thus begins an adventure of memory and mystery as they search for both the ghost's body and his memories.