A very well-known group called the Manshier's are known for being very good Scientists. They aren't entirely wrong but, the group is way more than just Scientists. They are underground demonologists. They hunt down demons that are hurting humans and there are even some that are helpful to humans so… they don't hunt down every demon. They just study some, befriend some and kill some. Just depends.

They go to a certain town that has a ton of reports of a group of demons named the; Befieurs. They go to try and track them down, determine rather or not if they are good or bad and then resolve the issues.