If you're willing, check out the nsfw version in the related tab. There are a lot of horny chapters but one of them shows some of the more egregious bullying MC experieced at her hands.
She's 5'9"... probably weighs 130lbs max given japanese diet & shown bodytype. It's easier than you think to heft that with both arms, even if you aren't especially fit.
Anyways he for sure carried her home and they were married before graduation.
(Source is I'm a lanklet who carries his wife...