COTE : The Assasin's Syllabus, Koroizumi Seiji's New Game

After his poignant death at the hands of his students in Kunugigaoka's Class 3-E, Koro-sensei believed his story had found its peaceful conclusion. Fate, however, had other plans. Rather than moving on to the afterlife, the soul of the Mach-20 being awakened inside the body of a human teenager named Koroizumi Seiji. Seiji quickly realized that he hadn't just reverted to being human; he had also regained his original appearance from before those maddening experiments—the face of "The Reaper," the legendary underworld assassin. He now found himself on an "Earth" that was familiar yet distinct: a world devoid of the apocalyptic threat of a shattered moon, but teeming with political intrigue and psychological warfare. As the years passed, Seiji relentlessly trained his human vessel until he became a deadly weapon once more, all while reconstructing his loyal AI, Ritsu, within the digital realm. Yet, beneath his quiet and reserved demeanor, the soul of a teacher remained very much alive, yearning for new "lost sheep" to guide. Throughout middle school, Seiji wandered across Japan, subtly intervening at pivotal moments in the lives of several girls destined for prominence. He instilled a fierce will to survive within the bullied Karuizawa Kei; halted Ichinose Honami's moral descent; forged a quiet, intellectual bond with Shiina Hiyori; shattered Horikita Suzune's towering ego to help her carve her own path; and "tamed" the monster lurking inside Kushida Kikyo. Now, a new chapter in his life officially began with his acceptance into the Advanced Nurturing High School (Koudo Ikusei High School). Through Ritsu's meticulous analysis, Seiji discovered that this elite institution's system—built on absolute competition and the doctrine of psychological pressure—bore a striking resemblance to Kunugigaoka. A surprise awaited him when Seiji, despite achieving perfect entrance exam scores, was assigned to Class 1-D, the lowest tier reserved for students deemed "defective." Far from disappointed, Seiji welcomed the challenge with his signature laugh. He was determined to nurture yet another "outcast class" and forge them into champions. At a bus stop leading toward this new future, in a chilling stroke of fate, Seiji's eyes locked for the first time with an anomaly—a figure radiating an identical aura of darkness and extinction: Ayanokouji Kiyotaka. The predatory instincts within both of them instantly recognized an absolute, existential threat. And so, the lessons at Koudo Ikusei officially commenced. A fiercely arrogant political terrarium had just invited a legendary "monster"—one who had once leveled mountains and shattered the moon—to come out and play.