Armor Break refers to the action performed by a playable-character during Sugar Rush mode to finish off a boss-character's Attack Pattern, with the purpose of destroying their Armor Tokens. It also destroys anything inside the playable-character's Magic Circle. The number of armors destroyed will change the story as well as the CGs unlocked.
A successful Armor Break will result in an Armor Break Bonus. The bonus gives the player points based on how fast they finish the pattern, as well as turning all enemy bullets into small macarons.