After death and before reincarnation, souls pass through Another World. Gudo, a spirit guide, befriends a young girl named Yuri and promises to help her through her difficult journey. However, Yuri harbours a rare curse that could threaten humanity if she`s consumed by anger. Through Gudo`s revelation, Yuri discovers a grave sin from her past life. Unable to forgive herself, her growing anger risks unleashing the curse. Charged by Goddess Mira to prevent this threat, Gudo embarks on a perilous thousand-year mission. Despite conflicts with his guardian Dark Sky, Gudo insists on giving Yuri a second chance at the risk of his life, learning that forgiveness and inner peace are the only ways to overcome anger and heal a broken world.