I selfishly want a sequel where they summon her back, just to resume her role as the second Holy Maiden, if not the next one. Ultimately to re-meet Mavi & develop their relationship further (as an alternative ending, for example). But as this one is bittersweetly obvious, she's only the second/side character & her role is concluded as just enough to help everyone else until her time came.
So now I'm imagining for my own complete satisfaction if she'd ever tried to stay behind... & receive Mavi's true feelings lol & clear her name & path for the peaceful future beside the FL & everyone else. But alas.
For me personally, this one-of-a-kind manga is a 10/10. Btw guys, the artist still has five other awesome works we can enjoy including A SEQUEL TO THIS MANGA, so to cleanse our palate, let's read em marathon lol.