@amZa well since he's not wearign the boys uniform it's a violation of the school dress code, it's not illegal, but if he's never found out by the teachers he could be safe, but we are not given a reason why he's crossdressing yet, it could be the same situation as otoboku, he just likes crossdressing, or something else
@Blackbird no shit sherlock, the brown haired person is a girl(or maybe not, we have no 100% concrete proof she's a girl yet, than again we don't any proof that she is a crossdressing boy either, however given the context the former is most likely)