SHUFFLE!

The discovery of gates to the realms of gods and demons a decade ago brought magic and supernatural beings into the human world, leading to a new era of coexistence.

In Kouyou Town, Tsuchimi Rin, an orphaned human student living with his childhood friend, attends Verbena Academy alongside students from all three races. His ordinary life takes a sharp turn when the God King and Devil King move to town with their daughters, who harbor long-held affections for Rin from a past encounter.

In a shocking turn of events, both kings declare Rin as a potential suitor for their daughters, promising him the throne if he chooses one of them. Faced with this unexpected predicament and the prospect of becoming either a god or a devil, Rin's life is thrown into a whirlwind where secrets unravel, destinies collide, and fates intertwine.

[From Wikipedia and Getchu]