Destiny's Princess: A War Story, A Love Story

The setting is the Warring States Period of a world slightly different from this one. The heroine is the princess of a castle who has spent a life of comfort and ease. But, strange demons invade, and her castle is attacked to the point of being taken over for good. Five heroes from a different world are summoned through her wish. Can she protect her country in her role as princess and survive the crisis with the man she loves?