Kaho has been with her boyfriend Ichiro since college, and they married two years ago. Their marriage had been peaceful and harmonious until one summer, when she discovered the shocking truth of Ichiro's infidelity. On top of that, her attempts to get pregnant failed, leaving Kaho overwhelmed with deep disappointment and a sense of loss. During this difficult time, Ichiro's father, Tooru, comes to stay at their home while on a business trip to Tokyo. Tooru, who had always treated her kindly back in their hometown, reenters her life—and Kaho finds herself gradually drawn to him. Realizing she is subtly attracted to her father-in-law, Kaho's heart pounds with determination. Finally, she makes up her mind to visit Tooru at his place.