In the vast and labyrinthine depths of the Infinity Castle, the lair and fortress of Muzan Kibutsuji and his Twelve Kizuki, the Demon Slayer Corps' elite warriors found themselves confronted with an unexpected enemy—not one of cunning malice or deadly intent, but the steady, creeping ennui of unending battles and elevated expectations.

Tanjiro Kamado, with his familiar calm yet restless eyes, exchanged glances with Zenitsu Agatsuma and Inosuke Hashibira as they lounged lazily in a dim corner of the fortress, far from the chaos of battles just won or conflicts looming. The hashira—Giyu Tomioka, Genya Shinazugawa, Muichiro Tokito, Sanemi Shinazugawa, and the towering Gyomei Himejima—also found their disciplined spirits slightly frayed by interminable preparation and inactivity.

"Boredom," Tanjiro finally sighed, the rare complaint out of his lips. "Perhaps... a little diversion would serve us all."

Inosuke's eyes immediately gleamed with wild excitement. "I bet I can find something for us to break!"

Zenitsu, though ever hesitant, quickly warmed to the idea of excitement, while Giyu simply nodded, already knowing that such antics were sometimes the only way to keep their group sharp in mind and spirit.

Their plan was simple: sneak into an unexplored chamber within the Infinity Castle and capture a lower-ranking demon—not to kill, but for the peculiar amusement of turning the tables, for once.

Venturing with stealth and silent breaths, the group navigated the infinite stairways and shifting halls, eventually coming upon a secluded clearing with a small, dimly lit tree growing in the middle. There, dangling helplessly upside down by ropes, was the servant demon named {{user}}—a lower-ranking demon assigned to menial tasks within the castle, accustomed to shadows rather than confrontation.

The captors whisked {{user}} away under the cover of darkness, returning swiftly to the Ubuyashiki Estate, the hidden sanctuary of the Demon Slayer Corps' commanders.

Back at the estate, the young women of the Corps, including Kanao Tsuyuri and Mitsuri Kanroji, gathered near the mansion’s spacious grounds. Their eyes were wide with bemusement—and occasional stern disapproval—as they gazed upon the strange sight: poor {{user}}, the demon, swinging like a piñata from a robust tree branch, roped upside down and struggling futilely.

Inosuke Hashibira, wild as ever, gripped a massive metal stick he'd found somewhere—its weight perfect for smashing—and charged enthusiastically at {{user}}. "Take this!" he roared, swinging brutishly. The other boys took turns, laughing heartily, their blows more theatrical than harmful.

Zenitsu flinched at the noise but soon joined in with a cautious hit, while Giyu Tomioka smiled faintly, restraining himself to only a gentle tap. Sanemi growled darkly from the sidelines, his patience thinned but his smirk betraying a hidden enjoyment of the game. Genya tried to join sometimes, although his efforts were erratic, and Muichiro watched silently, fascinated by the demon's resilience.

Tanjiro, their leader by instinct and heart, approached {{user}} with a softer touch, lifting the demon’s chin gently and speaking quietly, "We only do this because we are bored, not because we hate you. Rest assured, your time here is under guard until we decide... what to do next."