Five years after divorcing her husband, Maiya took her son Masaru and his friend Kenta to go clam digging for the first time in a long while. They were enjoying themselves on the beach, but when Maiya returned to their lodging, she smelled the familiar male scent on Masaru's discarded underwear and couldn't help but pleasure herself. However, Kenta caught her in the act and began to blackmail her... Soon, she was called an old lady and toyed with like a sow, and eventually, even her beloved Masaru got dragged into it...
