It's really a shame that we will never have any real scene with madalyn knowing her importance in the plot.
She is a succubus and she was just using the retarded mc from treasures of nadia to get to her goal, she has no reasons to be "faithful" to him, we didn't even have enough scenes with her.
The good thing about this new game though is the more mature MC, the previous MC was just cringy af and would have never nailed more then Alia in a realistic story, i'm getting a "Deliverance" vibe to genesis order and that's a good thing.