Jahy, conqueror of the earthly and demon realms (through friends subordinates). But she still won't be discouraged in reviving the demon realm, or in avoiding the landlady of her apartment.
I would have been happier with this conclusion between them if she was just a yandere, but I guess this works too. I think I would fear her more now than she was before this chapter. Nobody likes a rude awakening. Jahy-sama just can't get everything what she wants; she is always going to be in a situation where her win is outweighed by a loss.
I really hope this doesn't mean this is ending soon. There are so many other humorous things that could happen and there's still so many things Jahy can experience in the human world. That and this manga is too good.
Also, I really want an anime adaptation of this. Like, right now.