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This
I support you 100% and am willing to help as well
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Well it's little personal project all along and has been doing it for months now (thus it made me slow marking the mangas i've read) i use hashtags and little summaries to make it easy to search i'm telling you it's a totally daunting task. I'm currently slowly going back the earlier mangas i've read and do fixings. Check it http://www.mangago.zone/people/tag/49344/multiple+stories/
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It's no limit now, takame-chan. Look at these summaries..
http://www.mangago.zone/read-manga/le_th_tre/
http://www.mangago.zone/read-manga/le_th_tre_de_b/
Aghhhh! I get so frustrated when I'm looking for a story that I know is in a multiple-story manga, but I can't remember the main title or author. So then when the summary is shortened (or missing), my search won't find the manga, dammit! I volunteer to help correct this, if anyone's paying attention...