Chijiro Okita has been stuck in a difficult phase of his life for some time. After struggling to decide between finding a job and attending university, he is now spending his second year preparing for the entrance exams. Living alone and attending a cram school, he finds it increasingly difficult to stay motivated and focused on his future. Everything changes when Mio Takasaki suddenly joins the same cram school after her parents relocate for work. Mio immediately stands out: she is exceptionally beautiful, confident, and highly intelligent. While Chijiro continues to struggle with his studies, Mio is so academically gifted that her admission to a prestigious university seems almost guaranteed. However, beneath her seemingly perfect appearance lies a much more daring side. Mio has a strong interest in sex and is remarkably open and proactive about her desires. Rather than waiting for Chijiro to make the first move, she takes the initiative herself and quickly grows closer to him. Before long, their relationship becomes increasingly passionate and physical. Although they are supposed to be concentrating on their upcoming entrance exams, studying gradually takes a back seat. What begins as an unexpected encounter at cram school develops into an intense romance that makes it increasingly difficult for either of them to focus on their studies and plans for the future.

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