Both Akiko and Kenji are legendary fighters that recently welcomed twin sons into their home. Oddly enough, one child possesses the trait of blonde hair and blue eyes while the other child has black hair and red eyes. They are Kayatu and Kin respectively. Kenji eventually grows weary of the dangerous lifestyle associated with his father's army. As Kenji was away to make amends, unforeseen danger befalls his wife and sons. Kayatu is abducted by Raiju, Kenji's older, werewolf-transfrormed brother. This macabre phenomenon will leave a devastating consequence that may change the family's life...