I genuinely hate Morishima Yuji and I hate the author for introducing him as a character. He's utterly unnecessary and feels like a forced (and failed) attempt at creating a funny character. I might actually drop this if he becomes the classic protagonist's pervert friend whose whole purpose is to literally be a pervert and act as a contrast to show just how much of a “loser virgin” is the protagonist.
Though I'm not gonna lie, the white knight protagonist one-sidedly “protecting” Fumi deciding for himself that she's some kind of pure maiden isn't to my taste either. Dude gives off massive incel-in-the-making vibes.