This is just the OVA episode from "We never learn"
Basically here, the characters are invited by mc's mom's friend, as she opens up a new business and that is providing marriage facilities, well basically she opened up a place where people can get married.
So all of them try on the outfits including the mc and they all have a photo shoot,
It's a really good episode and even if you ship one girl with the mc, it's still fun to watch as all of them get embarassed and their cute reactions were something.
I liked it, it was fun for me to watch
Do I recommend? Yeah, sure