MC is summoned in a different world, but is then abandoned and left to death as she wasn't supposed to be summoned dud to some treaty between countries. While she was walking down the street, some thugs approach her. Of course they try to rape/kill her, but the ML pops up and kills the thug. The ML is a psycopathic killer who takes her in and fucks her claiming that she is his, and calls her sister.
The Man Who Saved Me on my Isekai Trip is a Killer