Gekirindan (逆鱗弾 "Imperial Wrath Bullet" ) is a vertical scrolling shooter developed by Taito where players select one of three different fighters (a futuristic fighter jet, a helicopter conditioned to space travel and a remodeled old fashioned plane) against a destructive army of mechs through different time periods.
In the year 3195 a time machine is created on Earth and is promptly stolen by an unidentified, mechanized being known only as the Huge-Boss. The Huge-Boss quickly uses the time machine to travel back in time and destroy 3000 years of human history. The only resistance HB faces is a group of pilots from different time periods who aim to stop the HB, though some have other reasons than to save mankind.
Player 1 pilots:
Hokuto: A strong, though effeminate looking pilot from the 3100 era whose parents were killed by Huge-Boss' attacks. With his mother's hair-tie as his only tangible remnant of them, Hokuto vows to avenge their deaths with the destruction of HB.
Player 2 pilots:
Grother: A confident, no-jokes pilot from an unknown time period. He keeps a picture of a beautiful dark-haired woman with him, but it's unknown who she is.
Shario: A beautiful and ingenious young woman from the 3100 era who attempts to fulfill the last wishes of her recently deceased sister that will be accomplished with HB's destruction. She always travels with her strange looking pet cat.
Orsa & Mayoru: Two young elfen pilots and nature lovers, possibly from the 3100 era.
- The soundtrack (once again composed by Zuntata) mostly consists of the first level theme song remixed differently for every level with no boss themes.
- This game has many references to previous Toaplan / Toaplan-developed Taito games.