The year is 20XX.

Monsters got out of the Underground after the battle with Flowey. From Mount Ebott, which is located in The state of California, the County of Fresno.

The main character is Elena Mirskaya (She is 14 years old), she is an exchange student from Russia, who studies just in the state of California. Her father Ivan, a military man, lives with his daughter.

She is sitting in class with other students, there is a lesson going on.