A mentally broken yukkuri. Tends to be unrecoverable.
Similar but different from anti-yukkuritis. In anti-yukkuritis the yukkuri becomes completely defunct, unable to do anything but mutter "easy easy" or unintelligeble words until they die. In madness the yukkuri can still do stuff after going crazy. Some common example of the things they might do after going crazy include eating stuff they normally don't eat (e.g. a non-buri happily eating poo-poo) or going on a mass-murder rampage.