Marie's career is going uphill, the world is being conquered, and contact is being established with demonic students. There is a groom, although not everything is smooth and easy in the relationship. “Maestrina’s big plans” deal a crushing blow not only to lazy students, but also to the demonic creature from the Upside Down. Who knew that this is exactly how you can get a pet, creepy on the outside, loyal until the last breath on the inside. Everything is going great, but suddenly new problems and old enemies arise, and every intelligent creature, willingly or unwillingly, becomes a hero, showing strength of spirit. And it is moments like these that give time to comprehend and understand who is a friend, who is an enemy, who is a loved one, who is a nobody. Maestrina has no time to be bored. Enemies have been defeated, personal life has been smoothed out, only the secrets of the past will be revealed, and familiar strangers will meet by the will of the gods. What will Mariella and Maria choose for themselves? After all, in each of the worlds there is room for only one of them.