Ryosuke, who works at a publishing company, lives happily with his wife Tomoko. Their peaceful married life is threatened by Yuzuri, a wealthy heiress from the same company, who strongly opposes their marriage. Through her scheming, she orchestrates Tomoko's kidnapping and imprisonment on Slave Island. One year after Tomoko's disappearance, Ryosuke stumbles upon information about Slave Island and heads back to the island to rescue her. This dangerous journey is driven by his determination to save his beloved wife and uncover the dark truths of the past.