A man gets pulled into immortality against his will, bound to a woman he doesn't know, chasing a cure that might not exist. The romance that blooms between them isn't a subplot, it's the entire point, and it carries real weight because both of them are already broken before they meet. By the time you understand what she actually is, you've already fallen for her, and the show knows the cost of that.

Yakumo Fuuji is a young man whose life turns upside down after an odd chain of events ties him to the last surviving member of a race of three-eyed immortals. To keep him alive, she takes his soul into herself, which makes him immortal too and leaves him bound to her as her servant. Together they set out on a journey to find a way for him to become human once more, and plenty goes wrong along the road. His companion has two very different sides: one is adorably sweet, the other is a blunt force of destruction. Romance grows between them as they travel. This four-episode OVA mixes action, fantasy, horror and romance.