Japan built its postwar reputation on low crime rates, which makes the film's subject harder to explain: a string of killings committed by teenagers with no clear motive. It moves through individual cases rather than statistics, following the accounts of a bullied classmate who turned violent, a boy withdrawn into online gaming forums before his arrest, and a young gang member, alongside an aspiring lawyer whose case reveals a hidden history of violence. Interviews with victims' families sit alongside these profiles, giving the film its bluntest material: parents describing what they lost and what they still don't understand about why it happened. The film doesn't settle on a single cause, instead laying bullying, isolation, technology, and social pressure side by side as possible threads running through each case. What holds the film together is the unease of a society that expected this kind of crime to be rare, confronting cases where it clearly wasn't.