The year is 21XX. Dr. Thomas Light and Dr. Albert W. Wily, the two greatest scientists in the world, have passed away of old age. Their projects seemed to be doomed with being unfinished.

However, not everything is lost.

Dr. Alexandra Volt, an alumnus from the Mechacchusets Institute of Robotics, takes Light's place and has managed to finish DVN-Alpha Roll, a housekeeping robot and the first Robot Master Dr. Light had intented to complete. After assessing Roll's movement capacities in an earlier test, Volt has decided to put her through a combat simulation.

For this, she arms Roll with the Roll Swing, a modified broom capable of being wielded like a sword and bypassing enemy protection. Once Roll was equipped, Volt sent her into the simulation and has her fight eight prototypes of the late Dr. Light's design.