Sword Art Online, Rakudai Kishi no Cavalry Recommendations
Both series are fantasy/action series with a quickly evolving and adorable romance between the Main Characters. Both have visually spectacular fight scenes as well and solid soundtracks.
Swordplay and romance are center pieces of both of these anime, if you liked SAO and can handle a bit of ecchi you'll probably like this show
there both harems were the main character fights with a sword but in Rakudai Kishi no Calvary there in the real world so yeah
Both Main Characters have a bad image at first Kirito as Beater and Ikki with Worst One
Both have action packed scenes and the story revolves around action and romance