I see what you're saying. Fort the record - I do like Emma / Emy. I'm not opposed to seeing how she and the MC met or how things got to where they are for her. I'm simply saying all that can be done in a shorter manner. There is a way to shorten the backstory without sacrificing the quality or impactfulness of it.
As the game is still in development, I'm hoping this feedback might be of benefit to the dev as a way of seeing you can provide all the story and 'lore' (if you please) for all the characters, while making the overall experience more enjoyable to the players. Side benefit - if the dev can shorten the stories of the girls, he can save time and effort of rendering those scenes.
Again, all this is not (really) meant to be a criticism of the game. As I stated, I do like it. Personally, I feel the extra long back stories of the girls tend to draw one out of the moment and away from what we actually want to see - how the present progresses with the girls, not so much how the past shaped them. I'm not saying their past isn't important, just that it can be presented in a more digestible way rather than a huge lump sum.