Chevalier-chan went on a mission to rescue missing allies and eliminate the head of the evil organization. When she almost complete her objective, an enemy human-android appeared and neutralized her. When Chevalier woke up, she finds herself Immobilized together with her missing allies. A few minutes later an odd device attached to their heads and an irreversible process started. It was a brainwashing device that completely erased their memory and personality, turning them into emotionless low-level rank combatants. From now on they're nothing more than submissive slaves that obeys any command