Anata to Watashi no Kankei wa?

Yuka, 28 years old and without a boyfriend, decides to participate in the group date.
But what she meets there is a math teacher she had a crush on in high school...! The two become drinking buddies and meet more and more often, until one day they get drunk and end up spending the night at a hotel. "Ten years have passed, and I've grown up... but I'm liking him more and more... is it because I'm his former student? Or...?"