Matsuri Kazamaki and Suzu Kanade are childhood friends, bonded by their shared ability to see ayakashiyoukai in search of a life force to devour. However, in high school, their relationship deteriorates. As Suzu's one-sided feelings are growing, so is the difference in their ayakashi views: Matsuri considers all ayakashi a threat to his friend, while Suzu is an ayakashi mediumsomeone who exudes a significant amount of life force compared to the average humanand loves them all despite the risk.When the two stumble upon a talking white cat named Shirogane, they are unaware that it is a four-hundred-year-old ayakashi known as the "King of Ayakashi." He is hell-bent on gaining even more power by devouring Suzu, but as Matsuri swoops in to try and save her by sealing Shirogane's powers, the ayakashi uses a jutsu to turn him into a girl instead!Matsuri vows to protect Suzu from further harm as her best friend, but he must learn how to act like a girl until his grandfathera famous wind jutsu exorcist ninjacan undo the jutsu. Meanwhile, Suzu must work out her romantic feelings for Matsuri now that he is no longer a boy. But when Matsuri takes the king as his pet, the future of the two friends seems uncertain.
Japan may be brimming with mysterious monsters called ayakashi, but they have a special exorcist ninja force to counter the threat! Young exorcist ninja Matsuri spends his days fighting ayakashi to protect his childhood friend Suzu. But when an ayakashi cat named Shirogane shows up, things get turned upside down!