Kai

lives with the northern wolf demon tribe and is witness to their slaughter by a vicious badger demon under the command of Byakuya. The entire tribe was murdered and Kai and his younger brother Shinta was saved. Byakuya gives Kai a chain weapon and a Shikon shard, then orders him to murder Koga and bring back his shards in exchange for Shinta's life. In the Final Act, he and his brother attend Koga's wedding with Ayame.