Interest Stacks

Sometimes, the world is full of creatures or energy that normal people cannot see. It's a common trope to explain supernatural beings in an otherwise normal setting. It can also be used to isolate or distinguish the protagonist (or whoever can see the unseen beings).

First seasons only listed for simplicity (exception of Higurashi Kai when it's only revealed that a character can see a ghost god in the second season).

Credit to:
https://tvtropes.org/pmwiki/pmwiki.php/Main/InvisibleToNormals