Yuu☆Yuu☆Hakusho: Eizou Hakusho - Ankoku Bujutsukai no Shou

What would normally be just a few recap episodes in a reason turned out to be a musical journey. In these OVA's, and the one that follows, every song is done by the Seiyu's themselves, sometimes duets, with very vintage 90's japanese feel, across a variety of styles and genres. The episodes themselves are not much more than you would expect, but if you want some action, haven't really seen dark tournament that recently, it's actually a fairly enjoyable watch, and not all that different from Yuyu Hakusho. It's hard to justify watching these, because you could always just watch the show, but it's definitely ... worth at least one watch.