For those of you who can't read Japanese, allow me to translate it for you :)

The evil Empire of Baramekia has killed the parents of four young youths. These children form a resistance together and help the rebel effort in any way they can. They slowely gain more and more power and this brings them closer to being able to threaten the Evil forces. Former friends turn to traitors, only to later return to the side of good. In the end, it is not the Empire which threatens the world, but the insidious eveil which lies behind it all: the Dark Cloud.