Looking at doujinshi.org as reference, this is Toriumi Kapiko's 7th KajuMomo doujinshi, printed in 2011. After this they make Kancolle for the next 6 years until http://www.toranoana.jp/mailorder/article/04/0030/56/04/040030560443.html came out. By the time I find that, I'm sure there are still stocks left but somehow I didn't order it but I get this one from suruga instead.
I made a description here regarding how this book is scanned and why the size is bloated. Saving as grayscale doesn't reduce size and converting to BW, despite halfing the size, will make some background and blush disappear, so I stick to color setting.
@Bane13: Okay, we are cool. Sorry if I sounds rude before
I check back my scan files. The raw (before cropping)'s TOTAL size is 5.97 MB, that's around 400kb per pic with 1700 x 2040 dimensions. The problem is the raw was in jpeg and attempting to crop to 1440 x 2040 requires me to convert it to png, resulting in this bloated size.
every year I wait https://www.suruga-ya.jp/product/detail/ZHORE81822
@ Hyoros: If your gallery is off due to blanks that's fine. We react like that because of the spamming retards who use bulk image down-loaders and spam pixiv samples as if they were complete galleries.