Kanzen Saimin

is the primary technique of Sōsuke Aizen's Shikai, Kyōka Suigetsu.

Description
Kanzen Saimin controls the five senses to the point where it can make the target misinterpret another person's form, shape, mass, feel, and smell to be an enemy's. The initiation condition for the hypnosis is to show the enemy the release of Kyōka Suigetsu. After seeing it just once, this person will completely succumb to the hypnosis. Afterwards, every time it is released, this person will fall under the thrall of the hypnosis. The hypnosis is long lasting; the Visored are still affected by Kanzen Saimin even though they were hypnotized at least 110 years ago. Because the spell works when one sees the ritual, those who cannot see are consequently immune to the hypnosis. When Aizen turns off the hypnosis by force of will, the image shown melts away or shatters.

The Kanzen Saimin is absolutely flawless; even if the target is aware of being under the hypnosis, they cannot resist its influence. The hypnotic abilities of Kyōka Suigetsu make it a highly useful tool in combat, for Aizen can create simple or complex illusions to deceive his opponents. For example, by creating a decoy of himself, or other illusions to distract his opponents, Aizen can hide his own movements and attack with impunity. His opponent will remain focused on the illusion until it is too late to react. The power of Kanzen Saimin can even undermine the omniscience of Yhwach's The Almighty.

Drawbacks
While the illusions Kyōka Suigetsu creates are quite powerful, those with considerable power and skill themselves may be able to note slight differences in the illusions compared to the real thing, even if they are not able to determine what exactly is different. 4th Division Captain Retsu Unohana detected something was amiss with Aizen's fake corpse, even though she did not realize what it was until seeing Aizen alive. The Reiatsu of Kyōka Suigetsu gives it away to those keen enough to sense its actual presence past the illusions created by its complete hypnosis. The sole way to escape the ability of Kyōka Suigetsu is to touch the blade itself before complete hypnosis is activated.

Trivia

 * In Ryōgo Narita's novel, Bleach: Spirits Are Forever With You, it is stated that Aizen's Bankai can only affect those who are already affected by Kanzen Saimin.

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