Along with Daburanda, they search for ancient weason to invade the human world. Kos poisoned Kuntakku's father by the cup he drinked, which made the other dog species thought Kuntakku himself poisoned his own father.
After learning that Kuntaku is still alive, he asked Daburanda the call Saber to seach Kuntakku and his company. The plan somewhat failed, but he is able to predict that they are after the god statue, overwhelming them with military forces Daburanda has.
- In the original movie, Kos have a mustache but in the Daichohen manga and the remake movie he doesn't have one.
- In addition, he has the black sclera and white iris in the original movie, whereas in the Daichohen manga and the remake he has the normal pair of eyes like other characters has.