I saw this on Massively OP, with a comment there, as well as on the reddit thread they link to, that in the past pre-orders have sold out “pretty quickly”.
I pre-ordered both volumes in English, “Release Date: April 12th, 2022 (reprint edition)”, e-mail confirmation stated that I will not be charged until shortly before delivery:
> Please also note that we have not charged you yet. You will be notified by email before we debit your account, which will occur a few days before the delivery of your pre-order.