Anata to Watashi no Kankei wa?

Synopsis

Yuka, 28 years old and single, decides to participate in a group date mixer. But the man she meets there is the math teacher she had a crush on back in high school...! The two become drinking buddies and meet up more and more often, until one day they got drunk and end up spending the night together at a love hotel. "Ten years have passed, and I've grown up... but I still like him more and more... is it just because he was the teacher I liked? Or...?" (Source: Colorful, translated)