Kuusen Madoushi Kouhosei no Kyoukan, Rakudai Kishi no Cavalry Recommendations
Are you looking for another anime with action/comedy/school series? Both series is similar, because of the sci-fi/fantasy theme and the sword-combat action scenes. The male MC in both series has very similar personality, because they are both strong but hides their strength. They are atypical MC because they are not so dense as the ones you see in typical school/harem series. Both series takes place on a school where students is training to do sword combat and to fight for something.
So if you are looking for another funny, OP/strong MC with action/school/sci-fi/swordfight anime, then here it is.
Revolve in a high school boy that has been despised by the whole students, But their is some girl that acknowledge their strength and eventually fell in love and turned into a more like "harem anime".
Similar underdog setup with 3 underestimated students in a team fighting to reach the top, guided by a hated outcast teacher