The future... urban civilisation has broken down; the crumbling tower blocks and great cities are sinking into ruin as greenery encroaches everywhere. Man's greed, though, is as active as ever, and for those who still have access to power armour and the other trapping of high technology, the new Holy Grail is an almost mythical source of energy locked in a vast underground complex. The beautiful and hot-tempered Yuta is the key...