So 3 things to say:
First, the only acceptable polygamy is Amane, Ijichi and Seo from "Gyaru cant be kind to otaku?" or something like that, I forgot the exact name. And this actual manga just wants to do the same thing but with a slop plot and characters.
Second, the twins are pretty annoyingly boring without any good aspects beside being sexy or cute and thats all. Nothing special to them just sexy girls unlike Amane and Ijichi where they have their own personalities and passion which can be seen very early in the manga and gives them credibility into their characterization and who they are.
And third, why the hell fucking MC would date these two random ass girls and thinking about the future with them when they just met days ago while meanwhile he already have a really beautiful girl friend waiting for him in his classroom since middle school.
Truly slop shit.
I dont recommend it.