During a mission to hunt curses, Naoya Zenin gets caught in a technique left by an unidentified Special Grade cursed spirit and turns into a palm-sized plush doll. His consciousness is intact, but his body can neither move nor speak. The only clue to breaking the curse, which cannot be undone even with sorcery, is a 'kiss.'

Meanwhile, Guest, a servant of the Zenin clan who was cleaning the hallway without knowing anything, happens to find the fallen fox plush and decides to keep it until the owner appears.

And, as for the person in question right now...