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Ayumu Kamei, a somewhat clumsy high school girl, enters her second year with the hope of turning her love life around. However, her plans are hilariously disrupted by the arrival of Luna Takishima, a junior who was once her underclassman. Luna, charming yet mischievous, seems to take pleasure in teasing Ayumu, often going out of his way to make her life chaotic. Despite his antics, Luna secretly harbors feelings for Ayumu. As they navigate the typical high school experiences, from festivals to exams, their relationship evolves from rivalry to something deeper, filled with laughter, misunderstandings, and the sweet realization of mutual affection.