Release that Anti-Witch!

As far as Dust knows, he doesn’t have parents. He was raised in a tube-like cage and a room by the people called ‘The Church.’ But one day, a woman who call herself Nightingale appeared and save him. Who is this woman? What is the Church wants from him? Why do he need to kill this women called witches? Only one thing he knows. -He needs to find the man they called ‘Roland Wimbledon.’