A Slow Life After Being Expelled, Which I Never Wanted? I was Supposed to Have Retired, but Somehow I Ended Up Becoming a Beautiful Girl's Mentor, and for Some Reason, I Feel Really Nostalgic Chapter 15

Chapter 15 of A Slow Life After Being Expelled, Which I Never Wanted? I was Supposed to Have Retired, but Somehow I Ended Up Becoming a Beautiful Girl's Mentor, and for Some Reason, I Feel Really Nostalgic. This title has 20 chapters tracked and is currently ongoing.