We usually don't get the "Big Boobs Girl" as a potential romantic rival. She's usually shunted off into the background, but considering that the romance element was only hinted at in Clara's focus episode, I kinda love the idea of them playing around with a love triangle outright xD You almost never get those in Slice of Life or Isekai shows. Well, modern ones, anyway.
I think they made her the perfect serious girl, too. Usually they're mean. I think by the time we're done we'll have a love circle- so many girls it no longer has sides. I also think our hero we'll never know about his fan club. Even though I think Asmodeus and Clara would make the funniest couple, it'll be fun to see what she does with love rivals.