Talk:Shop/Purchasing/@comment-25918018-20150813124652/@comment-26824604-20150813150137

Try purchasing points on dmm.co.jp (the R18 version of the dmm). Some cards will only work there.

Had the same issue, fixed it that way (unfortunately that does mean navigating R18 area et all). The points purchased on dmm.co.jp using this page's tutorial are available in KanColle.