When I reviewed Abunai Sisters, I called it the worst anime that I'd seen at that point. While it still might have been the worst anime that I've personally watched, it has some stiff competition with Tenkuu Danzai Skelter+Heaven. At least this is 10 minutes shorter, so there is that.

The plot of Skelter+Heaven is set in the far off future, where a mysterious floating object suddenly appears in the center on an unnamed city. The top secret unit "Alta Mira Agency", or AA for short, is commissioned by the defense agency to deal with this mysterious invader. In charge of the robot training is Otsuya Fungai, and he must choose one of the people in the Alta Mira Agency to receive special training to use the "Battle Soles" to push back the enemy, even if it might cost them their lives."

Got that? Because the OVA sure as hell doesn't tell you any of that, and there is a reason for that. Tenkuu Danzai Skelter+Heaven is a very truncated adaptation of a visual novel for the PlayStation 2.

Now, if you're going to release a 20 minute OVA for your PlayStation 2 visual novel, what route would you take in making it? Maybe make it an adaptation of the first part of the story of your game with a "To be continued....." at the end to make people interested in continuing the story? Maybe make it more like a promotional piece that's full blown extended trailer for your visual novel, filled with an exciting look at the game, and maybe include interviews or gameplay in your promotional video? Well, this OVA is neither of those things.

Instead, this adaptation just crams a bunch of stuff from the game into 20 minutes without consideration to making it coherent in an way, effectively making this a complete mess that confuses people who have played the game, and is probably off-putting to people who might be potential players. Which just begs the question of why would you make such a cut down version of something like a visual novel novel if it's just going to end up as a complete mess. You might as well have just saved the money, time, and effort.

And along with poorly telling it's story, the animation isn't much better. A lot of the time the animation is just 1 frame of a character standing their with 2 or 3 frames of animation for their mouth to move. Other times when there is some animation, it's the bare minimum to call it animation. And a lot of the backgrounds seem like rough sketches that the animation team had to cobble together and color in because they didn't have the time or budget to make them actually look good. And that's just the 2D animation.

I want to call the 3D animation better, but I think that might be a result of just how cheap the 2D animation looks. Initial D Fourth Stage, from a series infamous for it's awkward handling of CGI, came out around the same time as Skelter+Heaven, and it's CGI was much better than this.

Since there was barely anything to this OVA, I decided to look into the visual novel. And from what I can tell is that it's a rip-off of Evangelion, with giant monsters attacking the city in a similar style and the main character having to deal with personal problems. Just go watch Evangelion.

Would I recommend seeing Tenkuu Danzai Skelter+Heaven for a night of watching bad anime? No. It's not entertaining enough to laugh at, and despite it being less than 20 minutes, it's still incredibly painful to watch.