Fortis Santa ~Three Will Come~

Joan, a "witch" who was expelled from the Church under suspicion of stealing a holy relic from the Vatican, receives a message from the Vatican while working as a mercenary in a war zone. She is told that Belial, the demon she had personally sealed away, has broken free and returned to the world due to an unknown summoner. The Vatican requests her help to seal Belial once more... To break free from the shackles of an agonizing fate, Joan plunges back into battle! "Three shall come. The one who killed their own kin. The one who made a contract with a demon. The one who points the blade. The three who will stain the Vatican in blue and burn it down—!"