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A secret technique known by the KirigakureHunter-nin, the user makes rain which eats up any chakra when it comes in contact with that is not of the same signature as the original user, such as Utakata's Soap Bubble Ninjutsu and Naruto's Rasengan.
Kirisame (霧雨) can be translated as "misty rain" or "thin rain as mist". "Kiri" is a "fog" or "mist". "Same" is "Ame" originally and means "rain".