What a fucking surprise. Never call the police. This is a Japanese work, after all, where you never call the police, no matter how much sense it makes. Nagi will get caught too? First, is that the concern here? When Nagi is probably get the crap beaten out of him, him getting in trouble is the concern? Second, yeah, it's often pretty true in Japan that the victim gets blamed too. But that just shows how shit the Japanese system is.