Souji develops a close bond with Sayaka, the daughter of Ritsu Shirakawa, a controversial artist known for his macabre paintings of death. While Sayaka blames her father for her mother's passing, a series of ominous events leads to the discovery of Ritsu's death. A final letter reveals that Ritsu was terminally ill and sought to reconcile with his daughter through one last painting, entrusting Souji to look after Sayaka in his absence.