Being a son of a cat demon and a human isn't all it's cracked up to be. As a half-demon, Niko has a unique ability: he can control his demon transformations. However, while he is participating in a Martial Arts tournament, where the best of the best are competing, his demonic powers become uncontrollable during his last fight with the last opponent he would expect. Meanwhile, Chisai Konami is falling asleep in class... again, when a sudden illness causes her to collapse, and change into something new: a synthetic cat demon. With the help of the mysterious Lord Tora, who helps Chisai control...

Chisai's been captured But by whom? The adventure continues when a mysterious figure appears at the cliffside where Niko and Kitsune chased Chisai, up to the point she disappeared With the help of some local family, the duo track down Chisai's location and encounter a fight they didn't expect After saving Chisai, they make their way back into town, but yet again encounter more enemies over one of the medallion pieces In the middle of the fight, a long time friend of Niko's arrives and makes a deal with Chisai and a few others, which may make Chisai double-cross Niko to give up his prized...

While Niko and his friends are off searching for the medallion pieces, Niko's good friend, Daisuke, was left in the dust. Feeling abandoned, Daisuke joins a gang and starts to steal, using a strange wind power - only to be caught by Niko and his new friends. Upon his capture, he tells his story and leads everyone back to his gang, where Niko is thrown off the side of a tall building, and the only person that can save him is Chisai, but her demonic abilities are not working. Can she save Niko without her demonic abilities? Meanwhile, Yakedo and Mizu are using the psychic piece of the medallion...

With his latest attack proving useless, his friends trapped, and facing a threat of losing his own demonic abilities, Niko disappears in the middle of battle After a close brush with death, Niko decides that he wants to get rid of his abilities, and there is only one way to do that: with Tora's help, but it comes at a price. Will he be willing to give up his own abilities for the sake of his friends? Meanwhile, Nakafumi and Kazeyama join the search for Niko and learn about - or already know - Niko's abilities and the demonic world. After a bit of research, and regrouping with Tsuyoki, Atamin...