A weapon in contract with Beatrice. 410 is a kid whose personality tends to cause her to speak arrogantly. She has a hobby of laughing at people who are serious or not relaxed, which is why she likes Siesta 45 and Lucifer. She speaks roughly, but she loves company and easily succumbs to loneliness. She gets depressed if she isn't always being looked after by someone. 410 has excellent capabilities in firing control, and exhibits matchless battle power even at close quarters fighting.