Being the only offspring of the late Kitsune Saiguu, Rai was considered a high-class individual in Inazuma. While on a journey in Yashiori Island, he was injured by The Tatarigami, resulting in facial and bodily lightning scarring. Once he had awoken after the accident, he had lost the majority of his memories. Upon searching his surroundings, Rai had “remembered” something about his current life: he was a pirate, looking for treasure on the island.