Tsuki ga Michibiku Isekai Douchuu is a unique anime in that it’s a fantasy where the MC isn’t above killing people. Normally in these type of shows, it’s all about the power of friendship and the MC befriending people. But the MC in this show actually kills people he don’t like. Tensei Slime follows a similar pattern in that if you really mess with Rimuru’s friends, he will murder the shit out of you.