Serial Killer Isekai Ni Oritatsu Isekai: Battle Royale

Alternative

The Serial Killer Is Reincarnated Iinto The Another World / Serial Killer Isekai ni Oritatsu - Isekai Battle Royale; シリアルキラー異世界に降り立つ 異世界バトルロイヤル; The serial killer is reincarnated into the another world. - Battle Royale in the Another World; The Serial Killer Descends Into Another World: Battle Royale In Another World; The Serial Killer Is Reincarnated Into Another World: Battle Royale