"How did Reimei realize they're a system?"
I mean do you want the Purple version of the story where she tried to ask OC!Gray what his favorite color was and was so convinced it was green only for said "OC" to insistently answer back that it was gray every time?
Or do you want the Cyan version of the story where a chandelier nearly fell on me and I saw my life flash before my eyes and it shocked my psyche so bad that in my dissociated state I downloaded Tinder, paid for premium, swiped right on as many people as I could so that I could lose my virginity because that somehow makes sense as something to do after nearly dying to a chandelier falling on you. And then when I woke up the next day to hundreds of matches and a planned fuckdate, I freaked out, canceled the date, deactivated my account, uninstalled the app, and then later that night another stream of thought introduced herself as Rouge in my brain and I had no control over what she said or did and it freaked me out so much I did genuinely wonder if I have DID but surely not, surely I'm just losing it because I had a crazy near-death experience that sounds absolutely batshit insane whenever you try to recount it to anyone.
Like technically these both separately count as system discovery stories but like. I dunno I think The Chandelier Incident is more iconic.
