Gaiapolis: Ougon Taka no Tsurugi

A oneshot tie-in manga to Konami's 1993 arcade Action RPG, Gaiapolis.
Originally published in Comic Gamest, with art by Shuzilow.HA, also known as Shuujirou Hamakawa.

It is the year 10,000 AD in the kingdom of Avalon.
Prince Gerard is in the middle of his sword training when he is ambushed. The illusion he witnesses afterwards brings a terrible premonition. Indeed, an ambush of another scale entirely is just about to start in Avalon...