So awhile ago (at least a year or two) I read a manga where the protagonist was a young school aged boy. His parents were murdered by a monster right in front of him, and somehow he got infected by the monster in one of his arms. His arm is now a monster arm and can morph. He is used by a government agency to hunt down these monsters since he is mostly still human.
I can't remember the name and its really bugging me.
Anyway, thanks in advance.
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Does the walker choose the path, or the path the walker?