Princess Lunafilia, shunned throughout her childhood after a mysterious illness left her legs impaired, has known only cold treatment and isolation. When her weakened body becomes politically convenient, she is forced into marriage with the tyrant of an enemy nation.

But on the journey to her new homeland, she is abducted by Cain—the fearsome King of the Night, a man whispered about in terror across the land.

“You are far too fragile for me to grant death,” he tells her.

Having long abandoned her hopes and dreams, Lunafilia begins, for the first time, to confront what it truly means to live.

Thus begins the tale of an overpossessive demon king and a lonely princess—an intense, all-consuming fantasy romance.