But the story has been telling over and over that, even though Natori san interferes the plot for the sake to keep Lapis sama from getting a bad ending, she herself realizes that no matter how she said and changed the plot, the development still progresses as it is, just as how the game setting is.
Aside from the change of relationship between Diana and the prince, which doesn't have any progress of romance, the story still implies that, there will be someone or something that will come up to stop Natori san from altering the storyline and goes back to track.
With these hints, I assume that at the end of this adventure, Natori san couldn't do anything to help change Lapis sama's fate to escape death in the game, and that Lapis sama will still be the villian of the game.
Though, whether or not Diana san and the prince will have a romance blossom is still in question..
And so, if Lapis sama's death is impossible to escape, I wish the ending will be where Natori san goes back to her world and meet the reborn Lapis sama in her world (___ )..
as if that's what the mangaka intends to do >_> ...
I wouldn't be so sure about any of this, not after it went all the way to try to turn the heroine into the villain instead. At this point, anything is possible.