Nagatoro and Sen make for an unorthodox couple, but how they push themselves to be better and the growth their characters go through is wonderful to read. It starts out rocky, but if you enjoy seeing people strive to become better for their loved ones I believe Nagatoro is the manga for you. It also has plenty of Slice-of-Life tropes one can enjoy, and the comedy isn't half-bad either.
Please don't bully me, Nagatoro