Tsunayoshi Sawada, the Forum's Black Moonlight

After watching his companions leave one by one, and the world collapse completely because of the conflict between the holders of the Cornerstones, Tsuna decided to save everyone in his own way. [Ding! The Black Moonlight System is now at your service.] [The special Jujutsu Kaisen arc, "Embers," is now underway!] A pair of very different twins was born into the Gojo family, one of the Three Great Families of the jujutsu world. One was born with the Six Eyes, a once-in-a-thousand-years genius. The other was an ordinary good-for-nothing, born without cursed energy. Tsuna, the sickly and untalented younger brother, was not even given the surname he deserved. He could only grow up in that rotten family thanks to his genius older brother's protection. To his older brother, Tsuna was a frail but sensible little brother. He was the best ally in the fight against the rotten higher-ups. He was someone worth protecting. Yet even someone with the Six Eyes could let his guard down. When Tsuna was seventeen, he was killed through a conspiracy between the family and the higher-ups. He died in the final moments before Gojo Satoru arrived, right before the eyes of his teachers and classmates at Jujutsu High. From then on, Tsuna's death became a nightmare for many students and teachers at Jujutsu High, and Tsuna himself became the "one who must not be named" among the school's upperclassmen. Until years later, during the Shibuya Incident. The mastermind behind it all finally appeared on the battlefield, Prison Realm in hand. He raised his hand, his warm brown eyes smiling just as they always had. "It's been a long time." "...Nii-san?" - Reading guide: * My take on the parallel world and the 270, may be out of character. * Memories of the past take up about half the story's chapters, with both sweet moments and angst. * There may be unusual pairings. Theme: Saving everyone after the world is destroyed