Kenta, a college student who has just finished his entrance exams, is being given in-depth guidance by his sister-in-law, who graduated from a famous university. Kenta was relieved that he was safe, but for someone who has dedicated his youth to studying, his sister-in-law's beauty was too much of a stimulus. Her beautiful profile as she smiles beside him, her soft body pressed against him, and her cleavage peeking out... Kenta is doing his best to suppress his arousal rather than studying, 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 amazing figure!