Close-knitted small group of people that are “different” and they try to keep it as secret from everybody else

By "different" it could mean something:

1) Supernatural, for example the characters have superpowers and they are secretly trying to save the world without everyone else knowing

2) Delving into secret interest or objective, that they dont want everyone else to know

3) Strange hobbies that alienates them from everybody else

Already read Secret History and loved it. The Persona franchise is like my favourite video games series of all time. Need something in similar veins.