Long ago, in the magical land of Mewni, lived two races of people; Monsters and Mewmans.
The two races have long fought over the land for many years, many lives lost to war and destruction.
Finally tired of losing loved ones on each side, the only conclusion they came to was splitting the land apart.

Mewmans would occupy the East while the Monsters would occupy the West.
That's how it had stayed for centuries, until one day, two unlikely lovers proved both races can live in harmony.