Man ever since Tonikawa Came out a lot more manga is just going straight into the marriage right away and I am all for sick of the HS BS drama half the time anyway.
I think its more the fact that at the time they were all struggling financially struggling so they had to make money somehow so its probably a pride thing
So this is just an edgier version of a world without lewd jokes (great show you should watch) and given how fucking anyoing this MC seems already I cant see this lasting long