College student Ryuji is captivated by Kazuko, his voluptuous, big-breasted married neighbor. Her lush chest and round, plump ass constantly fuel his fantasies, leaving him tormented with desire every day. One day, learning that Kazuko is home alone, Ryuji decides to visit her under the pretense of sharing some mandarin oranges he received. Kazuko is well aware of the lustful way Ryuji looks at her. Teasing him, she slowly exposes her ample cleavage, provoking his deepest urges. From this moment on, their everyday lives take a bold, unexpected turn.