In the land of Fodlan there is a legend a group of protectors known as the Makai Knights fight demonic beasts. A young man who is known as Garo assigniment is to go to Gareg Mach Monastry a school to trained students to become future of the realm. With Horrors wrecking havoc around Fodlan and war soon will be wages on. The battle will itself
will decide the fate of Fodlan

Garo x Female Byleth
Gai x Ingrid
Zen x Dorathea
Roze x Constance

The story will focus on Garo Yami Moresu and Gold Storm in Fire Emblem Three Houses

The Heroes Relics and Crests are capable of killing horrors.