It is neither a sequel nor a prequel. They were both 'supposed' to be the same story, with the anime being the adaptation of Morishima's manga version. But from what I know, the two versions are going to be completely different (though occasionally using the other for source).
Take that as you will, but I'm going to be pissed if Ikuhara waters down the yuri content of the anime simply to pander to the audience. Cause sadly, yuri doesn't sell well... At least we can hope Morishima won't sell out and take the manga down that route.
I'll admit, Ikuhara was the driving force behind anime like Sailor Moon and Utena, but reading quotes from his wiki, he prefers yuri subtext to het romance simply because het romance tends to take over the story a lot. So, I'm expecting the yuri to take a backseat in the anime :/
There's also the fact that he loves to load his shows with symbolism, that could get annoying at some point, and his last show was totally ruined in the second half because of it.
So long as it stays yuri, it's win still, at least we're getting some yuri anime ^^
last edited at Nov 15, 2014 4:32AM