His character name is literally Komagawa, so probably intentional then. She asks him out and he refuses and teases her. Somehow her pushing him away forcefully causes them to swap genders. His friend comes by later on and joins in as blackmail to not tell anyone else what he just saw. They pop back to normal near the end and he tells her to wait: I think what he's saying after that is he'd be willing to make out with her despite the "fatty pussy". To which she smiles and smacks him hard in the final frame. *PAN* like that can be a slap, or maybe the implication is she smacked him so hard that they switched again? I'm not sure.