Cross is the only female dog in the Ou pack and is accepted as a male. In her past before joining the pack, she gave birth to puppies. One day she went into Futago Pass with her hunting dog group and master. They were attacked by Akakabuto. She was wounded defending her master and all her friends were killed. Her unfaithful master got scared and abandoned Cross. After this incident she could no longer trust humans so she ran away and joined Ou's army.
During the conflict between the Iga and Koga dogs, she saves Kurojaki's puppy after Wilson throws it down a cliff. The puppy becomes part of the Ou pack after Kurojaki commits suicide by jumping into the burning House of Iga. It's later revealed that Ben is Cross's mate and she becomes pregnant with his puppies. It does not stop her from completing her mission, fighting or running with the pack. She leaves Ben on the ship and swims to Shikoku to tell Gin news about the other platoons captured in Mutsu. On shore she passes out and Benizakura saves her. His master wants to keep Cross but she has to return to her pack. Benizakura releases her after Gin proves his bravery to him.
Cross meets Oliver who helps her travel in cars since running hundreds of miles while pregnant takes a toll on her body. Oliver also is able to help the Ou pack a few times travelling in the back of large trucks to get across the country faster. The day before the Battle she gives birth to three puppies, Ben, George and Minnie. She understands Ben's fighting spirit and allos him to fight Akakabuto. Cross tells him to say goodbye to the pups,but he says he doesnt plan on dying. She watches the battle with their pups and they see their father face the evil bear with great bravery.