I will use the ninja world to aid my cultivation of immortality.

Naraku was an unremarkable member of the Root organization, his only notable trait being his beautiful 'partner' named Yakushi Nonou. This is Naraku's resume before the age of eighteen. After eighteen... he stopped eating beef! Awakening his innate wisdom and discovering his innate affinity for immortality, Naraku transformed from a ninja into a dedicated cultivator.