Seventeen-year-old Artyom is invisible in the family and a rebel in the technical school. He has a best friend, Kostya, and they do all the provocations and tricks together. When the management of the technical school compiles an unofficial list of dangerous teenagers - "explosives", Kostya, by pure chance, falls into the first place, which makes him popular among other students. Kostya revels in interest in himself - and betrays his friend, convincing his classmates that he, Kostya, is the main and only inspirer of all their antics. Then Artyom decides to prove who the “number one bomber” is really here. But on his way, a girl, Kira, unexpectedly appears, who is able to influence his dangerous plan.

Zero. Winter. Ural city. A high school student is beaten on the street. He is dying. Parents experience the tragedy in different ways. Mother finds the diary. Only after the death of her son does she begin to understand how he lived. The father is obsessed with revenge and is looking for killers.