Christian is an orphan raised from birth by the Paladin Order. He trains hard to become someone worthy of wearing the title "Paladin Knight". He becomes exceptionally strong and quickly rises through the ranks of the Order. But after slaying countless demons, beastmen, and others, he becomes emotionally numb to cope with the countless lives he's taken.
This is until he saves a beast girl from the sword of his comrade. He's then forced to choose between her life and his place in the Order.