>A (futuristic) school setting where they teach the kids how to fight in their own unique mechanized suits.
>A protagonist with short dark hair, a sword as his main weapon, a strong sense of justice, and of course, zero/very little common sense toward noticing how the girls like him.
>A roommate that's living together with the protagonist, who just so happens to be a girl disguised as a guy. She eventually gets caught by the protagonist when she comes out of the shower, and she has a major crush on the protagonist that he'll never quite come to realize.
>A girl with long blonde hair, a long ranged weapon (practically a sniper), big breasts, and a title that gives her high authority in the school. She uses her authority in a way that instantly upsets the protagonist and ignites a dispute between the two.
>To settle their dispute, they must engage in a public battle/duel using their mechanized suits. Duel ends with protagonist losing to her, yet the characters know that he's the unofficial victor of the duel.
>Aftermath has the blonde authority girl thinking about how impressive the protagonist was in the duel, and her interest in him grows from then onward.