Haimushi is one of the 63 creepy germs written in Harikikigaki, a book of medical knowledge written in 1568 by a unknown resident of Osaka. This tiny malevolent creature is believed to cause human illness during the 16th century in Japan.

It is a creature with appetite for rice and causes problems with the lungs. If the Haimushi exits the lungs and cannot find its way back, it turns into a fiery will-o'-wisp hitodama and the person dies.

The herb byakujutsu is effective in warding off Haimushi.

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