Tadashi is a high school student who is addicted to computer games. After spending a long day playing the game Zenon, a character named Sartova visits him in a dream. In an anime-like twist reminiscent of The Last Starfighter, she transports him into the world of Zenon, where the game now carries real human stakes.
The story begins with our hero Hiroshi casually beating an arcade machine and impressing all his nerdy friends. When he returns home, he discovers a strange new game waiting on his computer. The game promises him a chance to win the affection of a beautiful girl, so Hiroshi clicks "Yes" to begin—only to have the screen turn to static before his eyes.
The next day, Hiroshi starts telling his friends about this mysterious game, and they are uncertain whether to believe him. But then, in the middle of class, a massive electrical storm erupts, leaving behind a single white egg. When Hiroshi touches it, the egg opens, revealing a beautiful, stark-naked girl with green hair.
This girl, Hiroko, bestows upon Hiroshi the name Zenon and grants him various powers, including ESP. That is all well and good, but from that moment on until the very end, Hiroshi/Zenon finds himself constantly battling all sorts of evil villains and powerful enemies to protect his new sweetheart.