The story of an ordinary college student's interactions with his senpai at work, who happens to be in high school.
I Don't Want To Lose To My Younger Senpai-chan. is a completed manga by Nametake, first published in 2017. It blends romance, comedy and slice of life. You can read all 11 available chapters of I Don't Want To Lose To My Younger Senpai-chan. online for free on MangaPulse; the newest is Chapter 10, added 2019-04-29. The series is finished, so you can read it from start to end in one go.