Mitsuba Sousuke, a Kamome Academy middle schooler, met his end in a traffic accident while shopping for his mother’s birthday celebration. Lingering as a locker-bound spirit invisible to most, his afterlife took a brutal turn when Yugi Tsukasa warped him into the Broken Neck—a violent entity destroyed by Hanako to halt his torment. Reconstructed using the core of the previous School Mystery No.3, Mitsuba rose anew with amplified powers, bound to Tsukasa yet haunted by fractured selfhood. His androgynous visage—pink hair, a mole under his left eye, and a neck scar from his demise—evolved post-resurrection: a red tasseled scarf replaced his yellow one, while a tattered jacket studded with watching eyes, clawed talons, and a bony exoskeleton-adorned scarf marked his role as the Hell of Mirrors’ overseer. This domain let him traverse reflections and glimpse his fragmented past. Arrogant and quick to mock, Mitsuba cloaked profound isolation behind boasts about his looks. Childhood bullying forged a passive, people-pleasing facade in middle school, yet loneliness persisted. An award-winning nature photographer like his late father, he avoided capturing people, though quiet care shone in gestures like planning his mother’s surprise. Rebirth left him adrift, dependent on the feared Tsukasa and prone to uncontrollable outbursts. His bond with Kou Minamoto, a steadfast ex-classmate, anchored his search for purpose amid existential turmoil. Though wielding mirror manipulation and a weaponized scarf, emotional volatility often undermined his powers. Mitsuba’s journey intertwines memory and belonging, his interactions with Kou and Nene Yashiro flickering between genuine connection and defensive withdrawal. These shifts reveal a struggle between his constructed supernatural identity and lingering human yearning—a ghost grasping for recognition while fearing oblivion’s embrace.