since the manga really didn't do this part justice. She purposely tells him that she doesn't bath and keep up good hygiene in order to get him to back off which works to a certain extent. When he thinks of his loli "waifu" now, the image of her being stinky pops in his head and becomes...
spoilers for why her father keeps her locked up?
Below should be revealed not too far from now
there's a lot more to the above spoilers like why her family treats her like crap but thatd involve some giga spoilers im not prepared to write out lol