Matsuri Kazamaki and Suzu Kanade are childhood friends, bonded by their shared ability to see ayakashi—youkai 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 medium—someone who exudes a significant amount of life force compared to the average human—and 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