Before there was Water Breathing, there was Shigure Soen Ryu
Keep in mind that Hitman Reborn came out several years before Demon Slayer so obviously, the author of Demon Slayer possibly took inspiration from this
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Water Breathing
Before there was Water Breathing, there was Shigure Soen Ryu
Keep in mind that Hitman Reborn came out several years before Demon Slayer so obviously, the author of Demon Slayer possibly took inspiration from this