She has to tell true soon... although the typical "started as a joke but i like u" should be enough for him. Wonder tho, his friends and classmates sure like him but shouldnt be common sense to doubt if a beauty approach him like this? No one even seems to be worried why she likes him.
I am sure that the timid girl will say the gossip, then wakaba will self unlive by the guilty and late he will become his true form, the ugly bastard, looking by revenge