 If you liked
Unkai no Meikyuu Zeguy
|
 ...then you might like
Genmu Senki Leda
|
Main characters of those series are suddenly transported to a new, strange world. There they learn that they have some hidden power that is required to save this new world.
Of those two "Genmu Senki Leda" has a more comprehensible story but "Unkai no Meikyuu Zeguy" is not bad either. It would definitely work much better as a longer series, tho.
If you liked one you'll most likely like the other too.