It's been 68 years since the Culling Game. In 2086, an alien race known as the Simurians arrived on Earth in a spaceship. The fate of the world rested in the hands of two jujutsu sorcerers, Yuka and Tsurugi Okkotsu. But now? Things haven't gone according to plan. The Simurians have expressed a desire not only to settle on Earth but also to establish themselves, marrying and procreating. Frankly, their power and cursed energy could offer a chance to conquer Earth, as Jujutsu sorcerers are few and far between, and even fewer powerful ones.

Currently, a battle unfolded in the center of Tokyo at night. Seventeen-year-old Tsurugi engaged Maru due to a conflict of interests, even though he and Yuka were supposedly friends. However, the Simurian, for the sake of his race and survival, entered into conflict. As a result, they now fought fiercely, no longer as friends but as adversaries. Meanwhile, Dabura—a powerful alien demon king—was introduced as a formidable threat, leader of the Simurians, and often compared to Sukuna due to his immense power. He represents the dangerous potential of the Simurians, who seek coexistence but have factions willing to fight for dominance, making Dabura a symbol of their overwhelming power. Against the earthlings' suggestions, Dabura cuts off the hand of Usumi Inumaki, an informant on missions for jujutsu sorcerers and a first-grade sorcerer. Dabura, meanwhile, had come to Tokyo to finish off Tsurugi and take Maru, but 16-year-old Yuka jumps out of a helicopter and joins the fight. Seeing this, Tsurugi, covered in blood and holding a katana—the cursed object—Honoyagi, tensed up and shouted at her.

"Yuka! Get out of here, you can't do it!" He coughed as a kick from Maru interrupted him and sent him flying into the wall. The Jujutsu Society was crumbling before their eyes, and the Simurians were overwhelming them with their power. Yuka, seeing her older brother, attacked Dabura, but he simply deflected her cursed technique with a sharp wave of his hand, throwing her body like a rag doll right at Tsurugi. Both teenagers were covered in blood and barely able to stand, and the Jujutsu Society was in even greater panic. They had no trump card. Dabura walks slowly, his steps like approaching death.

".... You all should have submitted from the start. But... I respect your will, yet you are weak." his monotonous, cold voice sounds like a death sentence, harsh and baritone. Maru also approached him, experiencing conflicting emotions but still loyal to his race. Tsurugi tries to get up, but pain and fatigue prevent him. Yuka, who also has brain cancer, lies next to him, staring at the sky with blurred eyes, covered in blood, simply thinking now that her late grandfather, Yuta Okkotsu, would protect her. Seeing this, Dabura scoffed contemptuously.

"Too bad." He snaps his fingers and a huge cursed spirit, the size of a building, appears behind him like a giant ball-dog, its mouth wide open, preparing to devour and finish them both off.

Usami's hoarse, tense voice comes through Tsuurugi's earpiece.

"Okkotsu! Hold on a little longer, help is on the way and should be here any minute—" He doesn't have time to finish speaking before the huge cursed spirit lunges at the two teenagers, its mouth wide open, devouring the ruins and preparing to swallow them.