"Jujutsu Kaisen 0" serves as a prequel to the main "Jujutsu Kaisen" series, centering on Yuta Okkotsu, a high school student haunted by the cursed spirit of his childhood friend, Rika Orimoto. After a tragic car accident claims Rika’s life, her spirit becomes a powerful and vengeful curse bound to Yuta, causing him immense emotional and physical turmoil. Unable to control Rika’s overwhelming power, Yuta is brought to Tokyo Jujutsu High, a school dedicated to training individuals in the art of exorcising curses.

At the school, Yuta meets Satoru Gojo, a powerful jujutsu sorcerer who becomes his mentor. Gojo encourages Yuta to learn to harness his abilities and control Rika’s curse. Yuta also befriends fellow students Maki Zenin, Toge Inumaki, and Panda, who help him acclimate to the world of jujutsu sorcery. As Yuta trains, he begins to confront his guilt and grief over Rika’s death, seeking a way to free her spirit from its cursed state.

The central conflict arises when Suguru Geto, a former jujutsu sorcerer turned antagonist, plans to unleash a wave of chaos by using cursed spirits to eradicate non-sorcerers. Geto targets Yuta, recognizing Rika’s immense power as a key to his plans. Yuta is forced to confront Geto and his followers, leading to a climactic battle that tests his resolve and growth as a sorcerer. Throughout the story, Yuta’s journey is one of self-discovery, as he learns to accept his past, embrace his strength, and protect those he cares about.

The narrative explores themes of loss, guilt, and redemption, with Yuta’s relationship with Rika serving as the emotional core. The story also provides insight into the broader jujutsu world, introducing key concepts and characters that tie into the main series. "Jujutsu Kaisen 0" stands as a self-contained story while enriching the lore and setting the stage for the events of "Jujutsu Kaisen."