YorunokamiTsuki writes: Kara no Kyoukai, the hit doujinshi for the 1900's is finally being made into an animated movie! Ufotable has taken it into their own hands and have already redeveloped the charcters. visit http://www.karanokyoukai.com for more details.

So I'm not certain if this is a doujinshi or manga series... :/ I looked it up here and there's not much info. I guess the following is small but devoted? http://www.geocities.com/max3075/rakkyo/ says it's a 900-page novel. Oh well, hopefully someone knowledge can add info on it to the database.

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Kara no Kyokai is a franchise that began as a web novel in 1998 and continued as a doujinshi, drama CD, and light novel.

On side note: when one says "doujinshi" it doesn't mean necessary an adaption of a series into something else. Doujinshi is more than that. Doujinshi is primary a specific formating of panels and in most cases self-publication, hence there are many "original" doujinshi. ABE Yoshitoshi for instance wrote plenty of that type.