Satsuki Mei, a female college student, becomes interested in the "Oppai-do" (the way of boobs) she sees on television and starts attending an Oppai-do class. At first she feels confused and embarrassed, but with the guidance of her teacher, she gradually becomes fascinated with the art. A few months later, at her boyfriend Tatsuya's suggestion, she shows him the results of her training. Mei successfully completes a "piece." Later, Tatsuya also starts learning the "Oppai-do," and the two of them begin to pursue the "Oppai-do" (the way of boobs).