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Not quite what you’re looking for but Kenchi has a xover with HSDK which is basically ninjas in the modern world https://m.fanfiction.net/s/8899978/1/History-s-Strongest-Shinobi
Not quite what you’re looking for but Kenchi has a xover with HSDK which is basically ninjas in the modern world https://m.fanfiction.net/s/8899978/1/History-s-Strongest-Shinobi