Newlywed young wife Keiko visits her in-laws' home in a kimono with her husband to give New Year's greetings. But her husband quickly leaves to hang out with old friends, her father-in-law retreats to a long bath, and her brother-in-law heads out to buy fukubukuro lucky bags. Left completely alone, Keiko grows bored and begins quietly moving her fingers beneath her kimono, starting a bold act of self-pleasure in her in-laws' home. The thrill of being alone sends waves of nervous excitement and arousal through her body. At her peak, her father-in-law appears wrapped only in a towel, whispering, "Keiko, you're so cute..." Overcoming her resistance, he draws her in with his middle-aged desire and practiced skill. Just then, her brother-in-law suddenly returns home—and the lucky bag in his hand holds an unexpected surprise. Seeing it throws Keiko into deeper confusion and lust, ultimately pulling her into a forbidden three-way encounter. Her kimono flutters open, love juice spills out, sensual touches crawl across her skin, and her moans fill the air. As her consciousness blurs, she thinks she hears a voice calling, "I'm home!" That fleeting moment marked the true beginning of her married life.