From Pocket Comics:
Taichi Yamada, a self-admitted "unpopular" guy, suddenly gets asked out on a date by Miss Campus, Yoshino Sera. Taichi questions Yoshino's true intentions, only to find out that they have met her before, bringing back some unpleasant memories... A love story about an unpopular guy that will motivate you to take a step forward in your own love life!

Original Manga