As a part-time tutor, Fuutarou is given the task of guiding the five beautiful girls, who are "about to fail" and "hate studies", to "graduation". Fuutarou struggles to prepare for the school festival while keeping an eye on Ichika's studies, who has decided to take a leave of absence to focus on acting, and Yotsuba is even more determined than usual to make it a unapologetic school festival. Fuutarou is encouraged by Itsuki's decision not to give up, and searches for answers to Nino's feelings, Miku's determination, and her feelings for Ichika, Yotsuba, and Itsuki. With each of them having their own thoughts and feelings, the first day of the school festival, the last event of his high school life, finally began. "Come to the classroom at 15:00, the first day of the school festival." The quintuplets gather in the classroom and Fuutarou finally informs them that he will make a decision...