With his parents working overseas, Matsu stays at the home of his tsundere childhood friend, Yuki, and her gorgeous mother, Yasuko. While Yasuko is kind and caring, Yuki is a roughhousing dark-skinned kogal prodigy who loves to assert her iron will on Matsu. But it's not all bad for the young man, because when she has him locked up, he can feel her plump thighs and big bust smash against his body!