To be honeeeest
I like this story better than the main one, because the heroine (Marie) work harder and involved in the story more than Olivia and Liz.
How to say it... the two girls are cute and have their moments... but most of the time they are waiting to be saved or just not really involved in the plot with the MC (they feel like a collateral).
I guess the upside of only focusing on one girl (Marie) is a much better story focus involving few people than the focus going everywhere.
And even in the main story, after 50 chapter or so, even if in the Manga Marie is potrayed even more villainous, Marie become endearing in her way of keep working hard even when everyone around her hinder her way to happy life.
Hey, at least she still took responsibilities of the capture target even when they are broke and cut ties with their influental family hahaha