One day, Shota's attention is caught by a slim, busty woman wearing revealing clothes. He soon realizes she is none other than "Honoka," his friend's older sister. Knowing this, Shota immediately heads over to his friend's house. Inside, Honoka walks around in light clothing, completely carefree and exposed—her slender, big breasts making Shota's heart race just to look at her. Pretending to be affectionate, she playfully teases him with her breasts, and Shota finds himself completely drawn in by her irresistible charm.