The simplest way of describing the manga tbh. Though personally, I'd say the weirdness doesn't come off as bothersome. I can still see it as a part of the comedy, which might've been intentional by the author. I think people call this type of comedy as "absurd comedy", but I might be wrong in this regard.
What would the cat version be like? Sleeps at class? Meows for food mid class? Jumps out of the classroom's window to catch a bird? Hiss at the teacher or neighboring classmate? hmm