>>60253189https://hololive.hololivepro.com/en/talents?gp=promiseI think Promise has quite a bit more significance than Umisea or Holotori or any of those other units. I personally think they're aiming to treat Promise as an actual gen.
https://www.youtube.com/watch?v=KUouL2LPRDE&t=10146sJudging from what Kiara said here, I think the other girls were briefed on what Promise is and she came to the conclusion that Promise is a gen just like Myth and Advent.