Did you buy this at Houraigekisen in Japan, talk to artist as well? You can see the colophon page, 再版2018/02 ------ @Luc3at3i5: Yeah, when it's the reprint version, we use the date or the correspondence event.
@DarkMGA No, but I took the Melonbook and artist's pixiv page at its word: "2/4の砲雷撃戦で新刊出します", this was a new work being released at Houraigekisen on 2/4, which agrees with the date prior to the reprinting date. Is an immediate reprint really relevant information? ------ @DarkMGA I don't see how that helps anyone but if that's really policy then ok.