Aliens attacked Earth again and threaten the last remnants of humanity (Japan has been completely destroyed), but no, these are not green men; they are something incomprehensible... The remaining humanity resists them. There are so-called floating islands – the last hope of humanity, where Japanese scientists try to save the world and find weapons against the aliens (festums). To fight the festums, mech pilots (fafnirov) must introduce elements of the festums into their bodies, which slowly kill them.
Xebec Japan