Wysteria is a story where it's a normal, 21st century human society/world but all the sudden strange creatures begin to appear in the world that are comforting yet uncomforting at the same time. (Weirdcore/oddcore/dreamcore/taumacore/etc)  

Known as "Weirders", most have seem to integrated themselves into society, working normal, respectable jobs even.
Most have been proven harmless but uh.. some have shown to have pent up aggression.