Seiken Tsukai no World Break, Rakudai Kishi no Cavalry Recommendations
Both animes have male MC that attend martial arts and magic based school. He is surrounded by female characters that love him and were / are his lovers. In World Break MC is totally overpowered just like in Rakudai Kishi. There is a lot of harem situations just like here and tons of bad-ass moments just like here( they are still to come - when the first fight begins :). Also in both animes MC is cool headed and he don't get excited due to some mirror ecchi stuff - he react normaly, usually :D
I watched both shows one after the other some time ago and now I have trouble remembering which was which so yea, they're basically the same show.