That's possible, but would require weird time fuckery with the reincarnations. MCs mom died less than a year before MC did.
Even if his mom didn't only die recently, it would still mean either being reincarnated into different times, or that time flows drastically differently in the two worlds.
MC, his sister, and the princess are all around the same age give or take a couple of years if I remember correctly, so for the princess to be a secret second sister would be complicated.
That said, given the possible dynamics between MC and the princess, it would be interesting if she was revealed to be half sister. Like personally I went the redemption path with her, but just imagine learning she's you're sister after going the torture and rape route? That's be an instant route change for me at the very least
Yes, I noticed that, but I didn't mention it because we don't know if there's a difference in the time flow (which is possible). The princess is older than the protagonist by 4 years. So yeah, that would mean that the time flow difference wold be... Around 25 year to 1 year in the Earth.
I thought that too. For the ones that go with the revenge route it would be a great plot twist. I took redemption route too but checked the revenge route, and it would give a lot of mean to what the mc did to the princess' necklace (that was from her mother). Also, if I'm not wrong, the first time that her mother is mentioned is in that scene.
Even tho much more likely explanation for similarities between characters are the limited variations with Honey Select models, this is a really interesting theory and you never know there might just be some truth to it. It also reminded me of a thought I had at one time. What if Emilie from the first game is not just albino, but rather have some ancestry from the vampires in this game. If the cliffhanger really means that travel between worlds might be simple once mastered, there could be all sorts of crossovers between games and first steps into building proper AtemX universe not just having few conspiracy theories trying to connect the games.
Yes, the fact that both are blond it's not a a crucial hint. Without the other two clues, it doesn't mean anything on its own.
Yes, that's a possibility too. I took it more as an excuse so to have Emilie back as a different character, but maybe both worlds are connected in some way. Maybe we will know more about this if the cliffhanger doesn't end up being just a dream created by the dark elf. That actually gives me a new theory where the mc and his sister are actually children from the king (and full siblings of the princess) but that her mother took with her to Earth. If at some point the princess mentions that her mother died when she was around 5-6 years old, that would coincide with the time of his younger sister's birth and with neither of them remembering it (according to the mc, his father left when he was a baby). Now in this case, the thing about them being manaless only would maintain relevance if the mother was someone from the Earth that was isekaied and then went back years later. And perhaps what Ea mentioned about another goddess manipulating the threads of fate it's not about a direct manipulation to kill the protagonist, but the fact that the mc, his mother and sister being in that world is the anomaly itself.