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.
Akira returns to his hometown and reunites with his childhood friend Itsuki, only to discover that her twin sister, Sayo, has been in a coma for six years. After sharing a final, passionate night with Akira, Itsuki reveals her hidden resentment toward her sister and makes a supernatural pact with a mysterious girl named Chinatsu. Itsuki sacrifices her own life to wake Sayo from her coma, but the miracle leaves Sayo with total amnesia, forgetting her own name and identity.
Hiroshi returns to his family home following his father's death, where he reconnects with his sisters and forms an intimate bond with a mysterious girl named Ojo. However, he soon discovers that Ojo is actually a Grim Reaper who sacrificed half of her life to save him in the past. As his sister Chitose undergoes a critical surgery, Hiroshi must face the heartbreaking reality of Ojo's departure and search for a way to save the supernatural being who gave everything for his sake.