Heavenly Dragon System.

‘Atom’ is a boy who lost his parents when he was a baby and was adopted by a pair of slaves. In this world, slaves are not treated as humans. Since Atom’s adoptive parents are slaves, they are mistreated and eventually lose their lives. Now Atom is alone once again, and must carry the burdens of his family and do whatever is necessary to protect his younger sister, Aurore. But everything goes to hell when she is arrested by the Holy Church for being considered a witch. If Atom wants to rescue his younger sister, there is only one thing he can do. He must confront the Holy Church, who rules the continent with an iron fist! N/A. The protagonist of this story is a morally ambiguous guy and will often make decisions that don't align with a traditional "hero."