Monu Yu Sheng Nu De Shiyong Fangfa

After the father remarries, a new stepmother moves in with a young aunt named Qianhe. The protagonist, Sanqiu, had hoped for a normal life but soon discovers Qianhe is a demon-slaying immortal. Sanqiu is also a target of demons, leading to repeated attacks. Meanwhile, a childhood friend named Xiaoyou reappears. She is an elite assassin working for the Deity management organization known as the "Banished Deity Bureau." Xiaoyou now views Qianhe as a romantic rival and acts with hostility toward her.