Watashi no Koi no Hajimekata (How to Start My Love) by Komari Morisawa, Volumes 1-4 KC Comics This is a romantic comedy about Chisaki, a high school girl with a wealth of knowledge but zero romantic experience, nicknamed "Match-Up Senpai." She is pursued by Reo, a younger, assertive underclassman, and begins to rehabilitate her love life. The story follows Chisaki as she gives up on her own love, but as her relationship with Reo deepens, she comes to know true love. I've only read it once, so it's in good condition.