by @tkmapple on twitter.
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Nope never been explicitly discussed but since he isn’t shown with it til he starts training it’s probably safe to assume his self-training did it. …Or Raizou. That’s always a good possibility… Or perhaps if you want somethin more wild like out on a paper delivery run and someone throws a rock at his poor face. Who knows
holding your yaoi hand over your friends when it rains so they dont get wet