Black Rock Shooter can be described as Casshern Sins X K-ON. The two parts of the show don’t intermingle though. The other-worldly, Casshern Sins esque place doesn’t crossover with the s’life parts. You’ll have a long scene involving two girls doing what they always do in anime followed by a scene of a girl in a black string bikini fighting another girl with horns and chains. The relationship between these two worlds is pretty obvious from the off and there’s no dramatic plot twist at the end. Essentially you could watch just the other-worldly action scenes and still have a perfectly intact story and a far better anime. Let me explain.
Cut out all the s’life scenes. You’re left with Black Rock Shooter wandering through this other world filled with checkered bathroom tiles and roman columns. She eventually finds the other girl. BRS offers her hand, possibly of friendship but we don’t know because the characters don’t say anything. The other girl refuses and they then have an awesomely choreographed fight scene. At the end the girl offers her hand of friendship again and we get that final scene. The end.
And it works! What we’re left with is an experimental animation OVA, with no speaking whatsoever, about a girl trying to repair her friendship with another girl. We don’t know why they’ve fallen apart but we don’t need to. Friendships fall apart for all sorts of reasons. But through the Powah of Lurve she breaks through and their relationship is restored. Better yet, since this is all done without any dialogue, it leaves the viewer to plug in the gaps however they want. It’s not difficult to follow either but it’s still cleverly done that you won’t necessarily have your brain in standby mode throughout. Plus you get that wonderful animation and artwork to gawk at, leaving you feeling refreshed and pleased with your viewing experience. A solid 8/10, well worth those 20 or so minutes.
Interestingly, [gg] released a fansub with exactly that (must have been incredibly easy to ‘sub’ something with no dialogue). For those who haven’t watched Black Rock Shooter yet I would strongly recommend you just watch that version. I’d love to hear from someone who does, just to see if my theory on how you’ll interpret it is correct.