A ninja protecting his childhood friend is standard anime setup until an ayakashi transformation flips the entire dynamic, forcing Matsuri to fight monsters from the body he's suddenly inhabiting. The show commits to this premise instead of treating it as a one-episode gag, letting actual character development happen across 12 episodes while keeping the comedy alive. Fluid action sequences and solid worldbuilding keep the momentum moving, though the excessive censorship (cat stickers doing heavy lifting) undercuts what the ecchi angle is trying to sell. This is what happens when you take a high-concept gimmick seriously instead of winking at the audience about it.

Matsuri Kazamaki, a young exorcist ninja from a prestigious clan, devotes himself to shielding his childhood friend Suzu from the ayakashi that fill Japan. Suzu is a medium whose vitality draws these creatures, and while Matsuri sees every ayakashi as a threat, she wants to stay close to them. Then Shirogane, a cat-like ayakashi called the King of Ayakashi, sets out to devour her. Matsuri manages to seal its powers, but Shirogane strikes back by turning him into a girl. Now he has to keep fighting hostile ayakashi while adjusting to his new life, and Suzu finds her feelings toward him growing more complicated. The result is a supernatural action comedy with romance and plenty of ecchi humor.