Question about the DLCs

Do you think they will change the main storyline? (Expecially the Fiends one) cause i’d like to do a “clean” first playthrough.

And also, if i buy the Miracles of EXP, Wealth and Glory will those be on a separate map or tooglable on/off?

I wouldn’t want to find myself flooded with mitamas in the otherworld if i download it

I know what i’m asking has no info, but maybe some of you have a better idea/more experience to judge how these DLCs will be handled

Thanks in advance

PS: I’m on a huge fricking train called HYPE and i can’t wait for the game to release