I'll Forget You Starting Today, Senpai! manga volume 1 features story and art by Megumi Yamaguchi.

Hiromi is suddenly reunited with her high school boyfriend--at a professional match-making service! But their reunion isn't a sweet one, because he doesn't seem to remember Hiromi at all. In fact, he starts making wild accusations that make her question all her memories from back then. This sharp-tongued stranger is like an entirely different person from the guy she remembers! Is this a match doomed to fail?