@draxdeveloper It's kinda like a joke. Because of how it goes "but is a maiden" with her...it does that to kinda mirror it while poking fun at the fact that he's completely ordinary.
@jokerxhisoka And everyone getting mad at him needs to look up Japanese Yankii and the kind of reputation they have and they'll better understand the MC's reactions to her.
@draxdeveloper It may also be a slight translation issue. In Japanese the 'but' could be conveyed with a '-kedo' at the end of the first segment.
If the sentence is "Looks ordinary but...is ordinary" it sounds a bit more fun/silly than "Looks ordinary, but is ordinary".