Hanada Akihito, a high school student, has always been used to living in the same house as his parents. However, when his parents get divorced, he is forced to move into his older sister's apartment on the second floor. Akihito finds himself in a new environment where he meets his sister's friends, including the beautiful and intelligent Natsumi, who becomes his partner in study sessions. As Akihito spends more time with Natsumi, he discovers that there is more to her than meets the eye.
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