CHAMPIGNON WITCH

Luna, a black witch who lives quietly in a poisonous mushroom house, deep in the Black Forest. She lives in the city making high-efficiency medicines, but it is said that if the "Mushroom Witch" touches you, you'll die, and she is avoided ... The life of a witch who doesn't know the warmth of people is carefully and momentarily drawn. — Description from AniList community (anilist.co).