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.
Sasha is an ordinary boy whose life is not much different from the everyday life of an average schoolboy. Sasha's parents are divorced, so they put their personal ambitions above the interests of their son. From lack of attention, Sasha begins to withdraw into himself. Everything changes when, after school, Sasha meets a new friend – a strange cleaner in a pilot's jumpsuit.
