In a small Japanese town, the life of five identical twin sisters takes an unexpected turn when they cross paths with a high school student named Fuutarou Uesugi, a studious boy facing financial and personal challenges. Each of the sisters has her own distinct personality: the smart and carefree Ichika, the tsundere Nino, the dreamer Miku, the energetic Yotsuba, and the adorable yet somewhat distant Itsuki. At first, the relationship between Fuutarou and the girls is tense, and the sisters view the new tutor more as a burden than a help.