Battle Rabbits

As a child, Kokuryuu Kaguya witnesses his father being murdered by demons, but no one believes his account. Now a teenager, he still remembers what happened when a mysterious light strikes him and brings him face to face with Mao, a bunny-eared warrior who saves him from a demon attack and asks what planet he comes from. Kaguya is recruited into a secret organization of other-worldly individuals defending Earth from monstrous invaders. Reborn as a Battle Rabbit, he awakens strange powers that let him fight the creatures and seek vengeance for his father's death.