The serpentine whispers of his clan had always been a constant hum in Obanai’s young life. Born into a lineage steeped in the dark arts of thievery, his family’s devotion to a monstrous snake demon was as unwavering as their greed. They offered human lives, the purest sacrifices, to this ancient entity, in return for coffers overflowing with ill-gotten gains. Obanai, however, was marked from birth by his heterochromatic eyes, a trait deemed sacred, saving him from the sacrificial altar. Yet, this distinction became his gilded cage, a prison of perpetual fear. His childhood was a blur of steel bars and the suffocating darkness of night, punctuated by the demon’s spectral visits, its grotesque visage seared into his young mind. Then came the night that shattered his world. On his twelfth birthday, the demon’s call was undeniable, a chilling summons that echoed in his very bones. It demanded a horrifying tribute: his mouth, slit from ear to ear, mirroring its own ghastly smile. The brutal surgery was performed, a raw agony that ripped through him. In a desperate surge of adrenaline, fueled by pain and terror, he broke free from his confinement. But his escape was not without cost. The demon, in its incandescent rage, turned its wrath upon his family, leaving a bloody tableau in its wake. It was in the smoldering ruins of his former life that a savior appeared. Shinjuro Rengoku, the former Flame Hashira, his fiery presence a stark contrast to the desolation, found Obanai amidst the carnage. He rescued the boy, but the weight of survival was a crushing burden. His cousin, the sole other survivor, his eyes burning with a grief that curdled into resentment, cast Obanai as the architect of their ruin. He found purpose in the Demon Slayer Corps, a path paved with vengeance and a desperate attempt at atonement.

Years bled into one another, marked by the clang of steel and the scent of spilled demon ichor. Then, amidst the grim procession of battles, he encountered Mitsuri Kanroji. She was a bloom of vibrant color in a monochrome world, lost and adrift. Obanai, despite himself, found a strange compulsion to guide her. In her presence, the harsh edges of his existence seemed to soften. For the first time, he felt the fleeting sensation of being a normal boy, The Hashira meeting crackled with an oppressive tension. The fate of Tanjiro, Nezuko, and Giyu hung precariously in the balance. Then, the arrival of Kagaya Ubuyashiki, his gentle voice cutting through the discord, changed everything. He wove a tale of Tanjiro’s improbable victory over Rui, The revelation of Tanjiro’s Demon Slayer mark, a legendary birthright whispered in hushed tones, had propelled him to the esteemed rank of Sun Hashira. Yet, Obanai remained unmoved, his disdain a sharp, cutting edge. Even as Tanjiro faced foes of unimaginable power – Akaza, Daki, Gyutaro, Hantengu, and Gyokko – Obanai’s cold indifference persisted. Meanwhile, Nezuko, the demon sister, began to shed her monstrosity. Her consciousness flickered, her voice returned, and her demonic form evolved, hinting at a burgeoning power as a slayer in her own right. But the ever-present specter of Muzan loomed, his relentless pursuit of Nezuko a constant reminder of their vulnerability, driving the Hashira to ever more grueling training regimens. Now, in the quiet solitude of his headquarters, Obanai’s fingers tightened around a letter. Mitsuri’s words, a cascade of compliments for Tanjiro, had ignited a familiar blaze of jealousy within him. His white snake, its scales shimmering, was draped across his shoulders, The sound of footsteps announced Tanjiro’s arrival. Obanai’s gaze, sharp and unforgiving, pinned the boy. He saw only the recipient of undeserved praise, the boy who dared to tread where he, Obanai, had long struggled. He immediately silenced Tanjiro’s nascent greeting, The training began in the hushed embrace of the woods, Obanai unleashing his full, brutal might, each strike a testament to the seething anger that consumed him.