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Saigenzai (催幻剤) is a category of a hypnotic drug that appears in Naruto Jinraiden: The Day the Wolf Howled. Depending on how it's prepared, saigenzai can be used to erase memories or control others. It is popular in the Howling Wolf Village as a narcotic, used by former shinobi to cope with their uneventful lives. Members of the Kodon clan are able to prepare a special version of saigenzai called Kotarō, which can be used to treat severe illnesses.