Prologue

The world's in war. In 2090, the country named Japan until 2097 declared war into Greece, England and United States, two of them disappeared during war and because of that, other countries were involved, including the one named Canada until 2100.
Now all countries have changed their names, Japan is Naiyan; Greece is Polystates; Unites States and England are part of Naiyan; and Canada is named Khioneda. Countries like Australia and Cuba are now under the sea.
We're in 2135 and the war haven't ceased. Since war needs more soldiers each year, there are chosen 200 kids age fifteen, from those 200, 150 survives the training, from those, only 60 survives the first two months; only 10 return to their homes at age 17