Uryuu Kamihate aims to enter medical school but finds his new foster home is a shrine where he must marry one of the three Amagami sisters and take over the temple.

When sinister forces threaten the peace of Britannia, a young prince embarks on a perilous journey to save his loved ones and discover his true powers.

Brought together by a mysterious song, a grad student and an engineer lead the fight against an unimaginable force that may spell doom for the world.