Jujutsu Kaisen Volume 0

Engulf the darkness to better fight it! At 16 years old, Yuta Okkotsu is a somewhat unusual boy. The teenager is in fact haunted by a scourge, an extremely dangerous spirit who does not hesitate to attack anyone who would harm his host! And for good reason... the creature in question is none other than the ghost of his childhood friend, Rika, who died in horrible circumstances.
In these conditions, difficult for him high school student to lead a normal life! After yet another accident caused in his establishment, Yuta is picked up by a certain Satoru Gojo, professor at the Tokyo exorcism school, who decides to teach him how to control occult energy