Isekai Slayer: Killing people into the other world

The story follows Louise Sanguine, a witch who respects and is part of the "Rebels against God" which consists of people reincarnated into the world and defeat fight against the Demon lord. Among the things, the rebels against God commit slaughter of the witch academy fearing the magic academy and witch known too much of their plans to kill the god. The story begins came back from the dead after making a deal with the evil god and meeting an unknown warrior from space where she put a slave contact on him and uses him as a weapon for her revenge.