Nagi's real brother, Sokke, is moving behind the scenes, and he declares his goal during a surprise visit to Sachi… Meanwhile, Nagi and Hiro spend the night at the Ama-Umi House, and their relationship will progress under the shared roof… As the hunt for Sosuke gets serious, Nagi is feeling competitive, and his savior arrives in the form of Ai-chan. Their first meeting is finally revealed… Finally, Erika pursues the mysterious “S” account on social media. Amid the growing tension, everyone's fate will take a shocking turn!!