A 15-year old Vika has to grow up. Only yesterday she was just a teenager and now she’s a mom. Catching sidelong scowls of adults, being mocked by peers, unbearable responsibility – it seems like the entire world is against her and Vika is all by herself. More truly, she has a child now, she’s not all alone.

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.

Fifteen-year-old Ars, due to psychological characteristics, spent most of his life at home. After moving with his mother to a small town, he decides to go to school. Ars faces a difficult path of socialization and verification of his moral beliefs. Due to the non-standard behavior and versatile hobbies of Ars, the initial rejection of classmates is replaced by interest and sympathy for him. Only the guy with the nickname Sissy hates Ars more and more, wanting to hurt him in every possible way, and, eventually, provokes him to a duel that will be a turning point for Ars.