After losing his wife and guide to the elusive "Guide Killer," C-class esper Kayden Wolf becomes a ticking time bomb on the verge of going rampant. After refusing all help, Kayden is forced to be guided by S-class guide Jupiter Balerix, which begins their partnership in looking for the "Guide Killer." But as the two of them work closely together, Kayden finds himself drawn to the much younger and seductive guide despite his still-grieving heart. And Jupiter doesn’t plan to push the esper away either...