In the Underworld, where the Lord of Darkness Pakir rules, an unusual winged man, Elg, was once born. He was the son of the captive marshal Lot and the winged Hydara. Pakir's servants intended to kill Elga, but Guidara hid her son on the distant Crystal Island. The kid lived alone for many years, and then made friends with the mighty Whale and the dolphin Zach. When Elg grew up, he obtained the Mist sword in order to use it to free his father. But the forces of Darkness prepared an insidious trap for him. Will Elg and his friends be able to resist the monstrous servants of Pakir?..