Moving next door to Ayane Shirotsuki and her husband due to college enrollment, a young man named Kyō notices something unusual. Normally, innocent, modest underwear hangs drying on the neighboring balcony—but today, clearly sheer and provocative lingerie is laid out instead. Kyō finds his eyes irresistibly drawn to it. Unbeknownst to him, Ayane, feeling a growing marital rut and fearing a sexless relationship with her husband, had recently bought the sheer lingerie in hopes of rekindling passion. Captivated by the translucent fabric, Kyō is overwhelmed by uncontrollable fantasies. Then, on a windy day, one piece of lingerie blows right off the line. When Kyō picks it up and returns it to Ayane, things begin to spiral...