Yukimura Yukinojo, a mysterious transfer student with a cold demeanor and bandaged wounds, struggles to integrate into his new school. While classmates like Serina and Reona attempt to reach out to him—the latter inviting him to join the swim club—Yukinojo remains distant, burdened by the traumatic memory of his absent father and his mother's emotional collapse. As the class prepares for a school festival, Yukinojo's internal struggle between his current life and his painful past comes to the surface.