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(spoilers)
From what I get from the story so far is that the world is about humans and witches. The witches come from the moon and in their realm they feel no feelings to a strong degree. If they go to earth they slowly start to experience more emotions, and slowly their emotions twist their minds or actions.
For humans some witches co-exist with them in plain sight. Some unfortunately fall victim to curses and the magic that witches use. Humans are protected by the enforcement witches who are acting out the law of "The moon". The Mc was cursed by a witch that tried to make him her familiar. Either the human is turned to a mindless monster or something else.
It seems like this enforcer witch is possibly in danger of being swayed by her emotions for the Mc, and she knows the witch personally clearly. It's heavily hinted she (enforcer witch) sees the other witch(main antagonist) as possibly her daughter and feels guilty for the wrong doings that she does.