After Riko’s death, Geto becomes disillusioned with protecting weak humans who create Curses. He goes rogue, murders over 100 villagers, and declares he will create a world of only sorcerers. Gojo tries to stop him but cannot kill his best friend — they part ways. A year later, Gojo kills Geto.
Young Gojo and young Geto (then best friends) are assigned to protect the Star Plasma Vessel, — a girl who must merge with the immortal sorcerer Tengen to maintain humanity’s barriers against Curses. The assassin Toji Fushiguro (Megumi’s father, a non-sorcerer with superhuman physicality via “Heavenly Restriction”) kills Riko and nearly kills Gojo. - jujutsu kaisen
Higuruma uses Confiscation (a law-based technique) to try to take Sukuna’s Cursed Tool (Kamutoke). It fails. Higuruma dies. A year later, Gojo kills Geto