It's been five years since I was the happiest shotgun in my life. The current situation is far from the marriage I had envisioned at that time. After giving birth, my husband's return began to be delayed day by day, and he often spent his time alone at night. And half a year after I stopped feeling the warmth of human skin, I saw a smartphone on the tip of my extended finger and the two letters "affair" on the screen. The "adventure named unfaithfulness" of Sumire, a beautiful wife who felt a crisis as a woman when she reached thirty, begins ...