This is adorable. Also Katarina calling Maria thick-headed is pretty hilarious considering how Katarina is in canon.
Speaking of which, does this count as Alternate Reality? I'm not that familiar with the source material, but it's a Fantasy Isekai series, right? The amusement park and hotel with an elevator are definitely modern stuff but Katarina still calls Maria a "heroine" a couple of times, so I wasn't sure.