Yu Haibara is a character from the anime Jujutsu Kaisen who died on a mission he was not supposed to do in the first place. He was a first-year student at the Tokyo Metropolitan Curse Technical College and was Kento Nanamis classmate. Yu Haibara was killed by the Ubusudokami, a powerful curse, during a mission to deal with a Grade 2 curse that turned out to be a Grade 1 curse. His death was a tragedy that impacted both Nanami and Geto.