Butterfly Storage

When someone dies, their soul escapes as a butterfly, and the body decays quickly. Fourteen years ago, Ono lost his family in a plane crash. His twin sister, Senri, remains physically unchanged, but her soul, in butterfly form, was taken during the accident, leaving her in a vegetative state. To recover her soul, Ono joins the "Death Bureau," a government agency responsible for capturing, preserving, and managing butterflies for 49 days after death. These butterflies allow families to communicate with their deceased loved ones through 3D holograms.