A weapon of the Sisters' Cavalry, which serves Pendragon. 556 was a quiet and teased character, but she was loved by everyone. However, her luck was always bad, and she met a tragic end in battle with the Black Witch. She was the latest style of weapon, and unique in the Sisters' Cavalry, which had a strong tint as an honor guard. 556 was in charge of squad fire support. She shot not to kill, but to protect her allies.
556 thanks everyone constantly, so that she would have no regrets of not saying it should they be suddenly separated.