Killua Gojo Sparda Son of Vergil Sparda and Sayura Gojo(female Gojo), at young age He spend training ever since his bestfriend Gon die from a attack from Mundus and his demon. After years spend time with his family, training ,hunting demon also meet supernatural and being close friends with Rias and Sona, Killua decided to travel to around the world but he and his family's got attack by Mundus and unknown enemies. Dante, Vergil, Nero, Sayura and the others sacrifice their own power and their lives to save Killua and Bayonetta . They got sent to a another world, unknown side effects they turned into kid and got separate through the blast from fighting Mundus. Watch Killua decided to live his life in New world, Follow up his legacy as the Dark slayer and the new White Dragon Emperor.