...I actually REMEMBERED it.
And it was an awesome dream. Not a long one. It was mostly just a framing device.
But all the same, I remembered it! (Partially because the dream stole from several notable anime, but I digress.)
Basically, to lay out the fundamentals, the setting takes place in the spirit realm, a realm which is not strictly speaking the realm of the dead but effectively serves that function.
People who're living can enter it, but it's mostly reserved for the dead, and they live in peace and harmony, having basically whatever they want, as a type of heaven. The catch being that there are also monsters around.
In order to fight these monsters, a few souls are born upon arrival as "Magers", basically Magical Girls except having an equal mixture of genders. These Magers all have special traits about them, and have established backstories as well...the catch being, this being the spirit realm, their recollection of events is imperfect. There are eight characters, and the plot basically (after a short introduction to each of them) kicks off with them meeting together as a group for the first time. The characters are:
-The "Rookie", a newcomer mager. He appears to be about 15, has black hair and brown eyes. In all aspects, he seems like an ordinary guy, who has been thrown into this situation against his will. He's inexperienced in combat, and barely manages to survive his first fight...but he hides a secret: unlike all other magers, he has perfect memory of who he was, and that man was an older, ~28-year-old spymaster in the army, a combat master, who dabbled in the supernatural even as a living human and who had researched files of people he saw in visions, tracking down the truthful identities of many of the magers. In other words, though he may be the newest full-time occupant to the spirit realm, he has been connected to it for over ten years, and is the most lethal wildcard on the team. He is also, incidentally, the protagonist. (I stole his design from Kirito in Sword Art Online.)
-The "Bishop", a stereotypical tough guy. Red hair pointed straight up (not in a mohawk, but sort-of similar in design), bulging muscles, wears a green army outfit that's sleeveless, tall, gruff voice, you get the idea. He was a 17-year-old lieutenant in the army when he died, and has put his military training to great use, being an explosives expert, laying traps, fighting in melee combat, and whatnot. He's been fighting for five years as a mager. The twist is, the Rookie reveals to him that he never was an army lieutenant--he was a 14-year-old kid that was being conscripted into the army against his will, who died before he ever made it in.
-The "King", basically the Big Good--an 18-year-old computer geek appearance-wise, with glasses, purple hair, garbed all in white, and the works. The interesting thing about him is that he has absolutely no memory of his past life when he was alive. Instead, he has the gift of precognition, seeing future events, and future events he sees are, 100%, guaranteed to happen as he sees them. The twist comes in that, like other characters, there's gaps. Events he see are guaranteed to happen as foretold, but because he can't see all the details, the future is still ambiguous, just like for the other characters how their past is. There is a slight variance on this, though. The King's oracle powers give him the chance to see what happens if he decides not to tell others about his visions. In 90% of the cases, the future shown is worse, so he usually discloses the full vision, even though the future he sees is often not exactly a pleasant thing.
-Marochi, an ex-mager who turned to the side of the monsters and has now taken up taming them for a personal army which he leads. He is, obviously, normally an antagonist, the direct rival to his former friend and ally King. He once fought together, and truly believed in the ideals of the magers, but the longer he was among them, the stronger his memories of his past life became, and the more he wished to do the impossible: return to that life. In other words, he became a villain in order to try and cheat death, return to the living, and resume life. This, obviously, is no easy feat, and in the case of Marochi, would basically require the destruction of a significant portion of the spirit realm, which the magers cannot allow to happen. He comes to the summit because he knows better than to ignore the summonings of King, and of course knows that magers are too soft to lure him into a trap like that. (If you couldn't tell, he's based off of Orochimaru.)
-The New Girl, who comes in shortly before the Rookie does. I'm thinking she has long, pink hair, but I don't know as much about her as I do the guys. I do know she's the other protagonist, though.
Then there are three other girls, too, but while I could flesh them out a bit now, in the dream I didn't really have much of them, I just knew they were there.
(Also, of the girls, one's a Queen, but I don't know which, one's a Knight, but I don't know which, and another is some variant on Pawn, but I don't know which. I also know that I want one of them [potentially the protagonist new girl] to be a transwoman, but I don't know which.)
King gathers the magers together to share a vision of the future. He basically tells them that one of the magers will betray the others, and that mager will become a threat worse than Marochi. Said betrayal would be triggered by King's death at the hand of Marochi, an event he knows is destined to happen some time in the near future. It may not happen instantly, but gradually, one of the magers would turn against the others, be twisted, for some reason. They would seek godhood, a feat not even Marochi dreams of, and in doing so become a threat not only to the spirit realm but to the whole universe. King foretells that Marochi will side with the magers to take down their former companion, and explains that Marochi will do so because the alternative is that Marochi dies, forever, and never fulfills his goal.
The twist is, King's vision is imperfect. He knows it will happen, but he doesn't know which of the seven it will be. He knows it cannot be Marochi, but any of the seven current magers could fall victim to this despair, and one of them inevitably will. The question is asked why King says any of the seven, to which King replies that while he sees his own death, that doesn't mean he necessarily will stay dead; it would be fully possible for him to survive and be morphed from the Big Good into the Big Bad, showing his genre savviness off. He can't see whether it's five or six magers fighting the traitor, along with ex-mager Marochi.
That's about all the details I have in my head. I was actually surprised at how coherent it was. It sounds like a really, really interesting story idea, a sort-of blend of mafia and the game clue from my understanding of how that game works: nobody knows the full truth about even themselves, yet alone, who the traitor will be. I think it'd make a great story, and might even have potential to make a good game, though for a game I'd have to let go of some of my preset ideas. (For instance, right now I don't want Bishop to be the traitor. One of the protagonists being the traitor could be done, but I lean against that, too, especially Rookie given that he's already a bit of a red herring. For the purposes of a game, those preset ideas would be dropped, in favor of having the only player cleared of being the traitor being Marochi who is in opposition to both the traitor and the heroes, simultaneously the most trustworthy and the least.)
Neat, what the subconscious can come up with.