Let me tell you about #LoveNikki, the prequel game to Shining Nikki.
Nikki, a random fashion student, is Isekai'd into the magical world of Miraland where all conflicts are settled via styling battles. This is because everyone in Miraland is under a blood curse where any harm you do unto someone is replicated in you.
Nikki, not from that world and therefore not under the blood curse, is the only one capable of committing murder.