Jujutsu Kaisen Finally, you made it here! Welcome to the fantastic “Which Jujutsu Kaisen character are you?” quiz! Jujutsu Kaisen, or JJK as fans call it, is a Japanese manga and anime series written and illustrated by Gege Akutami. The story follows the high school student Yuji Itadori, who joins a secret organization of Jujutsu Sorcerers after devouring the finger of an evil being called Ryomen Sukuna and gaining its powers.