556 is a quiet girl who is always teased by everybody, but for the reason that she is loved by everyone. Everyone skips to her lovely tune as she has the trumpet as her specialty. However, her luck was always bad, as she met a tragic end in a battle with the Black Witch. She was the latest style of weapon, unique in the Sisters' Cavalry, which had a strong tint in the honor guard. 556 was in charge of the squad fire support, and shot not to kill, but to protect her allies.