Such a shame this turned out the way it did. It had the ingredients on-paper to be a fun little OVA series, but it's just wasted on lame jokes, completely random and inconsequential plot, and empty characters.
The story starts off by introducing and uniting the three main characters... and then the rest of the story is driven by random events out of nowhere to propel it along. There's no telling how you got where you are and where you'll end up in the next five seconds. It's entirely disjointed and eventually just drops the very tenuous direction that it even had, which was vaguely "get back to Earth." But that goal doesn't matter, the events you're seeing one second don't matter to the next, and so on. The story is a wash, but the characters don't fare any better. They're as one-note from the moment they are introduced to the end of the series. Over 120 minutes of run-time, you don't know any more and they don't change at all from minute 15 to minute 60 to minute 120. They're a couple of traits that events happen to that can loosely be called "characters" and nothing more.
The action in the series is similarly pointless. It just happens. Lots of boom and bang segments but they don't matter, it's all just time being wasted to thrust the characters into the next location for a few moments in a never-ending chain of nonsense. It's like if Family Guy was entirely composed of cutaways, without the premise of an overarching story. And speaking of Family Guy, no matter what you think of it, I guarantee you've laughed at at least ONE joke. You won't be able to say the same for this. The humor is severely lacking. The bulk of it is extremely Japanese, but even if you were the most Japanese person alive, I couldn't imagine someone actually finding it funny. The jokes are mostly wordplay and the most superficial references to Japanese culture. Outside of that, all the jokes have little to no setup and little to no payoff. It's non-sequitur references and puns. After the first episode, the teacher character entirely devolves into making puns and poems. If you think a random haiku out of nowhere very, very loosely related to a thing happening on screen at the time would make you laugh, then hey, maybe I'm wrong and you'll like this show. And to be clear, it's just that the humor could only appeal to a Japanese audience: I've enjoyed many emphatically Japanese comedy series. The point is that even to a Japanese audience, the humor is the most shallow cultural references and wordplay that would make even the cultural ambassador groan.
The only positive thing I can say about this show is that it looks good. If it looked as bland as it is written, then I wouldn't have bothered past the first ten minutes. It clearly has resources and effort put into it, visually, which is probably WHY this show got cancelled instead of given two more episodes like it was apparently planned to be. It was probably hemorrhaging money from the animation costs so given its bad ratings, they axed it as soon as possible. I wish that art and animation and the character designs could've been used for a better series, because they were the only thing that got me through the four episodes in the first place. I should've just dropped it.
And that's the point of this review. This isn't the most terrible thing ever but there is so, so little here to make it worth watching. To make it even worth killing time with. It was a struggle to watch and the sum of my thoughts for the first two episodes was "I really hope it gets better" and the last two "I want it to just be over." Trust me, save yourself the time, and forget about this.