Sorata, a university student, visited the home of his girlfriend Aimi for the first time. There, he was introduced to her younger sister Kaede, who was cute and carefree, her braless breasts peeking out from her clothes. Unconsciously flaunting a body with larger breasts than Aimi's, his groin became fully erect. Perhaps noticing his excitement, the mischievous younger sister began to tempt him with her G-cup breasts. "Bigger than my sister's, aren't they... Are you falling for me?" Unable to restrain himself any longer, Sorata succumbed to his desires and indulged daily... A despicable boyfriend aroused by a sense of transgression.
