Rei has been married for five years and is living a comfortable life. - Rei, whose life has fallen into a rut, receives a wedding invitation from her best friend... - On the day of the wedding, when Rei saw her best friend and her husband, she remembered her own lonely life and felt lonely. - At that time, Rei is approached by Ozawa, a friend of the groom's side. - Feeling at ease with Ozawa's kind nature, she goes to a bar with him, and ends up crossing the line due to the force of his drinking. - Rei breaks up with him, but one day while drinking alone, she meets Ozawa again...