Towa is a girl who barely feels anything of the world, and experiences it as if looking from the inside of an ash-colored box. But her life begins to change when she meets a mysterious young man. Adapted from the manga series "Bokura no Sennen to Kimi ga Shinu made no 30-nichi Kan" (僕らの千年と君が死ぬまでの30日間) by Naked Ape.