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Character:

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.

Source from Wikipeida