It's an online fan comic based on Rumiko Takahashi's Inuyasha series, which has run in Japanese in Shounen Sunday Magazine since 1996 and in its own English-language comic, Inu-Yasha: A Feudal Fairy Tale, since 1997. The original Inuyasha story involves a quest by the title character, who is half human and half dog daemon, and his companion, Kagome Higurashi, a middle-school girl from modern Japan. As of February 2004 the story is still running, although it shows signs of winding down. (Mind you, I've been saying that for two years.) Because it's a quest tale, it presumably will have a definite endpoint (rather than being an ongoing series of episodes such as Superman, for example.)

We don't know what the ending will be. So we made one up. And now we're telling the story from there on.