Seeking What game is this from?

[NCRhomeboi]

I've found this on discord but I don't know what game is this from. I know there's "Koikatsu Saikou!!" on the ID. While searching it, I had no luck finding it. Does anyone know this video of what game it is?

View attachment 2717429-8593247d042982b29887647a6702936d.mp4