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Kenta, a college student who has failed entrance exams, is being given intensive guidance by his sister-in-law, who graduated from a famous university. Kenta feels relieved that he is safe now, but for someone who has dedicated his youth to studying, his sister-in-law's beauty is too much of a stimulus. Her beautiful profile as she smiles beside him, her soft body pressed against him, and her cleavage that he can see... Kenta is doing his best to suppress his arousal rather than to study, and his sister-in-law approaches him, saying, "Before you study, I'll teach you this..." The dreamlike first experience begins, with a step-by-step lecture from his beautiful, well-educated sister-in-law with an outstanding figure!