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A wide-range genjutsu (広範囲幻術, kōhan'i genjutsu), whereby the Second Mizukage, in conjunction with his summon, is able to manifest realistic mirages using the mist exuded by the clam. As it is impossible for observers to distinguish from the real thing through normal methods, this property makes the technique ideal for concealing the actual location of either individual, resulting in confusion amongst the opposition as their attacks are rendered ineffective and they attempt to ascertain the pair's true positions. However, in order to maintain the illusions, the clam must continually exude the mist from its siphons throughout the duration of the technique.
Kaasage Tachinai was also able to utilize this technique by substituting the Mizukage's summon for his reanimated shinobi; in this case Kōri Uōkā who could replicate the mist with the Hiding in Mist Technique. After Kōri was replaced by Nagano Hisomeru, Kaasage would utilize Gan Kanja for the same technique. Other users of this technique, have surpassed the need for a summon or medium, and create the mist themselves through this jutsu. In some cases, it isn't even mist, but a substitute.
According to the Mizukage, the only method to end the technique is to defeat the real clam but as the creature itself remains camouflaged within the mirage, this is no easy task, even if the summoner is providing beneficial advice. While the technique is in effect, both the Mizukage and the clam cannot be sensed through most means, with the exception of contact type (接触タイプ, sesshoku taipu) methods.
