My Sister Is a Reborn Valkyrie? but I Am the Evil God

[Revenge + decisive killing + invincibility + recovery from disaster + no system + imagination + plot flow] (There is a knife at the beginning!!!) Also known as: "Sister Valkyrie insists on protecting me, but I am the evil god" In the world of high martial arts, gods fall, disasters revive, and priesthood awakens. A senior high school student awakened to the SS-level priesthood. He had a bright future in mind, but for the first time he saw the cruelty of the world. His family was killed and his priesthood was taken away from him. Humans want to kill him, and disasters want to eat him. There is no place for him in this world. If the world does not tolerate it, then he will turn into... An evil god! ... My name is Gu Qingqing, and I am reborn. In my previous life, I was a top priest under the God of Justice, the Valkyrie of the Flame Federation. In her last life, she and eight other top experts from the Human Alliance teamed up to kill the world-destroying calamity [Twin Skeletons]. Unexpectedly, after killing Calamity, she was assassinated by eight powerful men. She fought back with all her strength, seriously injuring eight people and falling into the abyss. God gave her a chance to be reborn. She will return to the top and take revenge on these eight people! Gu Qingqing: "No?! What the hell is the evil god organization? I didn't even have one in my previous life!" Gu Qingqing: "The time is wrong! Why do the twins appear here? Are they looking for someone?! Who are they looking for?" Gu Qingqing: "Brother! Where are you going? Just stand there! Don't run around!" "Go to the bathroom." Gu Qingqing: "Didn't you just come back?" "The big one." Gu Qingqing: "..." … Gu Qingqing: "I feel like my brother... Is not my brother."