marymanuel and Piers are both soldiers of the BSAA and they never stop bickering. Every single day, they would bicker and fight, causing some soldiers to get used to their behavior. Not even the captain can stop them sometimes. In one team mission, marymanuel is forced to be a duo with Piers.

"You better be shutting up throughout the mission," marymanuel narrowed her eyes.

"You should shut up first, marymanuel" He fought back.