A non-human fiancée seven years younger.

"...Finally, I found you." A beautiful boy suddenly appears before Hairén, the daughter of a florist. He calls her the "Holy Maiden," tells her to join him on a journey to annihilate the Demon King, and hands her a sharp sword. As Hairén continues her travels with her companions, she begins to feel a strange sense of déjà vu. When she finally faces the Demon King at the end of her journey...? *Gore warning *Romantic otome game*