I had noticed a couple of weeks ago that in the new Bookwalker site they had changed the publisher from nothing to J-Novel Club; now I know why.
Something to point out, though: as can be seen on GoodReads, despite the fact that you are keeping the exact same format for the cover illustrations, there's a mistake at least on book 1 (I'd have to check books 2 and 3 more closely, but I believe those have no issues): in the original japanese edition, as well as in SB Creative's (the original publisher) version, in volume 1 Ai was making a "quiet" sign (extended pointer finger before her lips) on the cover, while she was holding a shogi piece in the inner cover; in your version, she's holding a shogi piece in both.