The head teacher of the printing college at the printing house, Adelina, tries to help everyone, but she always has to cope with her problems alone - raising her son Semyon, resisting the mayor's plans to demolish the printing house, and being responsible for her students, who jokingly call her "Mama Delya." In the daily flow of caring for others, she completely forgets about herself. Trying to raise Semyon as a real man, she holds him with a tight rein and does not allow her ex-husband, a businessman, to turn the boy into a major who is wasting his life. As soon as Semyon manages to escape from the control of the "supermom," disaster strikes: in order to impress the girl, he accumulated credits. Semyon does not even suspect that he received the money for a reason, but on behalf of the local banker Merinov, who has long wanted to appropriate the printing house, and is trying with all his might to eliminate the principled Delya, who is always interfering with him.
