This is actually two linked miniseries, Decade vs. Zi-O and Zi-O vs. Decade. And it's another Toshiki Inoue work, with plenty of death games, weird handling of queerness, casual character death, and edginess just for the sake of it. That said, it does have some interesting ideas in there - the third act twist of Decade vs. Zi-O is almost worth the price of admission. Plus, Tsukuyomi actually gets to transform and not die! Still, I'd skip unless you're a Zi-O completionist like me.