Even more than that, all the learning and research they can only do in places like that, in addition to making new and interesting friendships and acquaintances
the "piece of paper" is really the least valuable thing in all of this
Sounds believable, teenagers are not exactly the epitome of planned parenthood, especially horni bois like Paul a.k.a. someone that used to go around assaulting females
It's the moves from RTA Sousha chapter 2! :pacman:
https://mangadex.org/title/ac743453-99ef-49e5-93e5-265cfff01fe0/rta-sousha-wa-game-sekai-kara-kaerenai
I always thought it was skill that was retained (like players that speedrun games with nothing but the initial setup), and no MP concept since Fiona has been casting big-ass spells from day 1, but it could be something else leaking as well
They went back from that timeline, who knows what the demon lord (who can now remember, though they don't know it yet) has been doing
The theory someone put out previously, the DL possessing the arch-villain, makes the most sense so far IMHO