I uploaded the Volume 12 chapters of Yami no Matsuei, and I found they were appearing after the Ch0: Mahjong sidestory:
http://vatoto.com/comic/_/comics/yami-no-matsuei-r7454.
Is it possible for a mod to shift the Mahjong sidestory so that it appears after Volume 12: Chapter 63? I'm pretty sure it was published after Volume 12.
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Merged with relevant topic.