Set in 1917 during the onslaught of WWI, an alien invasion shakes the world. Setting aside differences the world stood united against these invaders. While all of this turmoil was occurring, Dr. Brunhield Stahlmüller, along with her assistant Harmuth Griesgram, had been developing an experimental aircraft codenamed the Red Beezlebub. This aircraft combined not only the advancements in aeronautical engineering known to man, but modifications based on the technology of the fallen foes. Taking to flight in this new aircraft, Stahlmüller targeted the Chessmaster in her quest to free humanity.

The player controls Stahlmüller in her plane the Beezlebub shooting enemy ships and collecting power-ups to aid in the quest. There are five stages to complete, each with their own end boss. Upon death, the current stage resets, no matter how far into the stage the ship has progressed. The game keeps a tally of the score you have achieved and displays it in a local leaderboard.