Jujutsu Kaisen: Hidden Inventory / Premature Death – The Movie

This is the innocent spring that the two strongest lost forever. June 2018, Yuji Itadori allows Ryomen Sukuna to inhabit his body.
December 2017, Yuta Okkotsu frees the Curse, Rika Orimoto.
Now, time goes further back to (Spring) 2006, when Satoru Gojo and Suguru Geto were still high school students. Both were active as Jujutsu Sorcerers with no enemy that could match them when they received a mission from Tengen, the cornerstone of Jujutsu society, who wields the cursed technique of Immortality.
Their mission involves two goals. To escort and erase the Star Plasma Vessel, Riko Amanai, the young girl compatible with Tengen.
The two set out on their mission to protect her for the continuation of Jujutsu society, but the Sorcerer Killer going by Fushiguro interferes, intent on assassinating the Star Plasma Vessel… The past that drove apart Gojo, the strongest jujutsu sorcerer, and Geto, the evilest curse user, will finally be revealed.