In this arc, there's a pivotal decision ahead. Not only will it potentially shape the story's direction in the future, but it'll also create distinct scenes within this upcoming update. One path centers around Luna, while the other spotlights Penny, although your decision might depend more on the world's events rather than the girls themselves.
Rest assured, while some other minor choices or bonus relationship points may hinge on this decision, you won't lose the path or any gallery scenes of the girl you don't choose, so don't worry about that. The harem path will always be a possibility!
If you played Once in a Lifetime, it's something similar to the choice between Lauren's and Judie's plan when you're about to attack the Major's house with Stabby Mike, but the alternate options will be more extensive. Whatever you choose, I highly recommend playing through both options to see all the content! There are cool scenes whatever you choose!
The conclusion of this arc will significantly hinge on the choices you make throughout it, so stay vigilant! During your adventure in Eternum, what might seem like a small decision or a inconsequential scene could have a sneaky way of coming back to you in the future...