The Distance Between Night and Dawn

The title is also called "Covenant of Thorns: Symbiosis of Light and Darkness" or "Brother Evil God Always Wants to Throw Me to the Light" [Middle Ages] [Sword and Sorcery] [Dual Perspective] [No System] [Time Travel] [Sister Control] [Pseudo Harem] [Cthulhu] (Not Many) [Newcomer] My name is Xing Yan. Due to an accident, the ritual originally used to summon the evil god summoned me by mistake. In a rage, I accidentally strangled the elder they called to death. Through memory reading, I understood the general outline of this world, and adopted the girl who was supposed to be a sacrifice and named her Xingyun. My name is Xingyun. This name was given to me by my brother. As for me before, I had no name, only a string of numbers. I've been here since I was little. The people around were expressionless and cold, and there were some who wanted to escape from here, but unfortunately they all disappeared in the end. Until the day I was called to be a sacrifice, I thought I was going to end this miserable life, but in the end, I met him, adopted me as his sister, and named me Xingyun. Maybe this name has some special meaning. "You can't be lazy, you know Xingyun? Read these books quickly." Xingyun: ""Basics and Applications of Magical Knowledge", "Basic Knowledge of Herbs", and "Advanced Mathematics", it seems that there are some weird things mixed in? "Xingyun, come and practice. If you don't even practice the most basic physical skills, how will you explore the world in the future? Xingyun said: "Isn't it true that I still have you, my brother?" I'm sorry, brother... Could you please come back? Xingyun knows that she was wrong. Xingyun will study hard. Brother... I'm sorry.