Why!?OH.Probably when they were entertaining us. It should be right to think that they were looking to keep us here, I guess?Fairy! You cannot swim, right? How are you planning to escape?!What? Is that not right?How troublesome...Same goes for you, doesn't it? Vampire...
Getting out of here is a problem, but there is another problem on top of that.Do we win if we just return back to land from this palace?When did this happen?! Why did the palace sink?! This sea is really vast!No, it isn't. Have you forgotten? This is the world within a book, right?... That is indeed what Patchy told me.When it comes to "the end of the story" for Urashima Tarou, "the end" was when he returned to land and opened a box called Tamate-box.That's right, it should have been done by someone called Urashima Tarou, but we advanced the story without waiting for Urashima Tarou to make his appearance.Vampire.
Before we entered the book, you said that we can only leave after "the story has reached its end," right?Now that we have rescued(?) the turtle(?), how does the story need to continue for it to reach "its end"...
In any case, unless we "make the story reach its end", even if we make it to land, we won't be able to return to Gensoukyou.You're right. So what happens in this situation?This is only my speculation, here, the one who "rescued the turtle" is Human.
If we consider that she is playing the role of "Urashima Tarou", then we may be able to leave by "bringing Human back to land and having her open the box".