The art is always very expressive and often detailed. I don't know where this story is going, but this felt like a very good introduction to this version of demons and ritual. I also really like Sunbi, our protagonist. I also like how the supernatural works with the human world. I'm looking forward to reading the rest of it and finding out the rest of the story.
What pisses me off though is that the grandma obviously knew what was coming, and yet she left Sunbi pretty unprepared. She didn't teach her much of the lore and none of the rituals. Maybe she thought she'd have more time? I don't know.
Also, spirits -- even good ones -- are dicks.