Moved from my blog (I clearly haven't written a proper review for this series and I wrote the original post back in 2011):
It's been a while since I watched Legend of Black Heaven, so I don't remember all the details, but here are some of my thoughts on the series. At first I thought that, because the story is really crazy, the show has a potential. Unfortunately I was wrong, this anime is quite disappointing. The only good thing about this anime was Oji's wife, who was the best character of this series and a also really good character in general.
But I'm writing again in a way that people, who haven't watched this anime, would not understand. Let me fix that mistake. I mentioned earlier "really crazy" plot, it goes like this: An ex-rock star is working as a salaryman to feed his 3 person family (it consists of him, his wife and their child). His pay isn't great and what's even worse his, wife starts throwing away his treasured possessions, including a LP collection and Gibson Flying V guitar. She does that because the flat they live in is really small and as their child grows, it gets more and more cramped. Oji (the protagonist) gets really upset about the guitar. Not only it had a great sentimental value to him, it also had a big monetary value, so big that he could not afford to buy another out of his small salary. At this point he is approached by aliens (let's call them good aliens) who ask him to save universe and earth from some other aliens (let's call them evil aliens). He is suppose to do that by rocking really hard in front of those evil aliens. The good aliens even recover his lost guitar. Also something starts to spark between Oji and a female officer of the good aliens.
The show suffered from following problems the main concept got old really quick, the animation was poor, even though it was a show about rock music, there were only 2 (3 if you count the ED) songs (the BGMs were poor and they don't count).
In the very first episode Oji manages to complete a feat, which he should definitely not be proud of. He manages to commit adultery without committing one. The office he works at has a new boss. It is an attractive young woman and she seems to hit on Oji. Oji, being upset with his wife throwing away his precious guitar, tags along with that woman's advances, as he believes, it would end up him getting laid. However he misunderstood that woman's intentions all along, as she was only trying to recruit him for saving the world on behalf of the good aliens. Yet, as the anime goes on, something does start to develop between those two.
Oji's wife notices that something is amiss and realizes that she went overboard with throwing away that guitar. She even tries to make it up to him to the best of her abilities (she buys him some cheap guitar out of her own savings). If I remember correctly, she also started to suspect that her husband might be cheating on her. If what I remember is true, then she wasn't that far off. In the end, what saves the universe is the fact that she believed in her husband despite all weird circumstances. She was probably the only thing preventing this anime from being really bad. I forgot to mention that she was doing the all important work of a housewife.
The three chick which appear in the ED, were rather annoying. By the way the ED had yuri written all over it.
"Cautionary Warring" sounds great, but the lyrics are somewhat suspicious.
The bits of cultural references through the series were a good thing. They joked of X-Files, Super Sentai. I wonder if the alien woman's name Layla, was a reference to Star Wars.
As far as I know, sound needs a medium (e.g. air) to travel and if there is no such medium (as it is in vacuum), there will be no sound. I don't remember exactly if they put speakers in space in this anime, but if they did, it was a complete nonsense.
Maybe I should rewrite this post into a proper review...