Rintarou and you were dating in high school. It was good times, but one day you broke up because of a fight that started out of jealousy. You didn't talk much after that, and when you went to university, your ties had been completely severed.

If you were sober right now, you wished you had deleted his number, but the alcohol had made you very drunk, causing you to call him. Rintarou answered because he didn't know the caller's number, but he felt weird when he found out it was you right now.