 If you liked
Spiral: Suiri no Kizuna
|
 ...then you might like
Gunslinger Girl
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While they have vastly different plots, they share a few aspects:
1) Both works deal with cursed children and their struggles to deal with their fate.
2) The children are desensitized to violence.
3) The children use all sorts of weapons (knives, guns, explosives) to fight.