The deputy director of the printing college at the Adelina printing house, Adelina, tries to help everyone, but she always has to deal with her own problems alone - raising her son Semyon, resisting the city's plans to demolish the printing house, and taking responsibility for her students, who jokingly call her "Mama Delia." In the daily flow of caring for others, she completely forgets about herself. Trying to raise Semyon as a real man, she keeps him on a tight leash and doesn't allow her ex-husband, a businessman, to turn him into a playboy wasting his life.
As soon as Semyon manages to break free from the control of his "supermom," a catastrophe occurs: in order to impress a girl, he took out loans. Semyon doesn't even suspect that he received the money not just out of kindness, but on the orders of the local banker Merinov, who has long wanted to take over the printing house and is doing everything in his power to get rid of the principled Delia.