OMG, so it was Leo's influence that made the goofy and laid back atmosphere of the Demon Castle the way it is. To think a story that focuses on cute little Twilight is also connected to him, it's quite a nice touch to the story.
I also love how Princess shows that she cares a lot for them and she really got attached to them (with her having no friends A-something-kun doesn't count and always being busy with public affairs in the human kingdom, it's really nice and heartwarming to see her development.)
And oh my, Suya's words in the last page. Does that mean Leo might actually have a chance with Suya?!