
so i know they call older men (brothers/boyfriend) oppa. so does that mean he is her brother or boyfriend? it keeps tossing me back and forth; please help clarify! (づ ̄ ³ ̄)づ

Oppa is used by females to address an older male.
it's used towards family and also boyfriends, and just other older males in general that may be friends / you are close with.
When he saw Mari's "Oppa" he assumed it was her boyfriend that she was talking about but he's actually her real brother. Since Oppa is used for so many different things it can cause confusion haha.

ya gotta think, he’s gotta be like, pissing himself. coming home, seeing a second him, seeing not only that person transform by also rin. WHY THAT CLIFFHANGER. this is the second supernatural manga i’m reading that’s been left on this big of a cliffhanger (other being Kami-sama no lutoori) (╯°Д °)╯╧╧
babe, holy crap, it should be illegal to be that gosh darn cute!! (╯°Д °)╯╧╧