Married for five years, Rei lives a life of luxury. But then, as her life becomes monotonous, she receives a wedding invitation from her best friend... On the day of the wedding, seeing her best friend and his wife, she is reminded of her own dry lifestyle and feels lonely. Then, Ozawa, a friend of the groom's family, calls out to her. Feeling a sense of security in Ozawa's kindness, the two of them go to a bar, and under the influence of alcohol, they cross the line... The couple breaks up, but one day while drinking alone, she meets Ozawa again...