Concept: an anime which is marketed as one of those "cute girls doing nothing" shows. But then episode 1 ends with something, like, obviously supernatural happening, like idk some girl the same age as the protagonists fucking materializes in a swirl of darkness on the school rooftop sight unseen, smirking down at all she sees, and like by the end of episode 4 it's gone full supernatural-thriller and the main four protagonists are regularly fistfighting vampires and/or angels or whatever.
Bonus points if they continue to advertise it as if it was just a slice-of-life comedy, the showrunners only talk about it as such and obviously-jokingly act confused when people try to bring up the magical girl nonsense or whatever, the next-episode previews and commericals exclusively show the mundane parts etc even when the episode is all about gearing up to fight the final boss who's immanentizing the eschaton.
