During an operation against an unknown enemy, Louise was wounded. Bersek hid her before going out to check their surroundings, despite her protests. He never returned, instead captured by the Invaders, who saw potential and experimented on him. Although little was changed with his appearance, a chip was implanted to force subtle loyalty to the Invaders. Already a skilled combatant while serving in the Regular Army, the experiments performed on him have further improved his strength and agility.