Yeah, I've wondered that for myself. Especially in the case that early on, he wouldn't have had access to any kind of cooking devices. Or anything to make their weapons.
In a sewer.
Where flames probably aren't the best thing to have around.
(I for one like to think that he had to steal a lot of things and rummage through garbage. But since a lot of these stories revolve around American "Ninja Honor", that probably wasn't the case"
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