Serial Killer Isekai Ni Oritatsu Isekai: Battle Royale

A goddess, troubled by the fact that there are too many reincarnated people, declares that she will start a massacre among them. The official spin-off of "The Serial Killer Reincarnated into the Another World" begins! --- Note: The main story was written by Ichigo Hitotsubu, but with the start of the new series, it was revealed that he is also working under a different name, as Kawamoto Homura.