Another mangaka makes a fundamental error; you complete the events leading up to the main story in the FIRST chapter. Everything prior to the main story events are chapter 0, and a waste of newcomers' time who want to know what the series is about.
It had me going at the "She's always wanted everything I had", making it seem like it was the stereotypical "green-eyed little sister".
But nope, it was me, Super Siscon!
Great subversion, author.
Uh, I don't think that's safe to just copy...
Many series that have "combine all types to create a ultimate type that erases everything" also tend to make it extremely unstable and require a training montage.
I dunno. These succubi seem to have remarkably little stamina doing stuff which should be as essential to them as breathing. Is [Taming] like a nerf?
Alma Elma would be very disappointed in this succubus queen's level of stamina and fitness.