I Was Supposed to Never Fall in Love with You.

Yasutaka Iijima, the glasses boy in the corner of the class, has a hard time with Ema Kitaoka, a gal in the same class at high school. However, after coming into contact with her at a third-year camp, he discovers she is entirely different than he thought. They start to talk to each other outside of school. (Source: Ichijinsha, translated)