I know that this was already posted, but...
Damn. Is it just me, or is this rather low? For a series that essentially shares a premise with Quintuplets from Magazine and have anime of similar quality, to boot the difference in sales is absolutely astounding. While Quints's last volume is managing to outsell those of all of Jump not named One Piece or Demon Slayer (and selling more volumes than any manga this Oricon year not named OP or KNY so far), WNL is on track to be the lowest-selling of the established series not named Yuuna. (I'm pretty sure some of Champion's newer hits have higher print counts now.) To say nothing of Young Jump's Kaguya-sama, which sits comfortably in-between Quints and We Never Learn saleswise despite being absolutely beloved everywhere you go and having a stellar anime. Still, that manga is selling well. It's hard to explain sales, I find, but here I just find this stark contrast way too interesting - what's the difference here?
Last I heard from the Young Jump forum, there were two types of reprints: regular reprints and urgent reprints. Series that are growing tend to receive the latter. That's my understanding, anyways.