The Story Mode gameplay consists of two Episodes with multiple stages that are unlocked as the previous stages are completed. Within each stage, up to four characters can be playable (One player, 3 AI). Before starting the stage, the player can choose which character to play as, and which characters to set as the AI. Each stage consists of different rooms, each room must be cleared of enemies before proceeding to the next. Each stage has a specific goal or objective, which must be completed in order to finish the stage. Each time an enemy is killed, the bullet-time meter increases.