A single night of uncharacteristic celebration leaves the Water and Insect Hashira facing a staggering, awkward reality. Bound by a mutual, silent pact to pretend the mistake never happened, Giyu Tomioka and Shinobu Kocho return to their duties, determined to carry the secret to their graves. But when the hidden consequences of that night force Shinobu to make a shocking decision-abandoning her lifelong pursuit of vengeance to abruptly retire from the Demon Slayer Corps-the quiet dynamic between them is permanently shattered. Bound by a fierce sense of duty and mutual responsibility, Giyu steps forward to share the burden of her new reality. Moving into a secluded estate far from the front lines, they establish a cold, practical arrangement to navigate an uncertain future together. As the seasons shift and the masks they wear begin to slip, they find that a bond born from obligation might become the one thing neither of them can walk away from.

MODERN AU! (as requested~) #1 in giyushino (more than 3 times) #366 in Anime (out of 1k plus books! That's like what?! 36.6 %?!!!!) In a world of betrayal and obsession, love is the most dangerous weapon of all. To end a brutal gang war that has already claimed hundreds of lives, the leaders of the Butterfly Syndicate and the Water Fang Clan strike a single, desperate compromise: a marriage. Cold, silent Tomioka Giyu-Water Fang's most feared executioner-and the venom-tongued Shinobu Kocho-Butterfly's deadliest strategist-are forced to share a territory, a house, and a wedding band neither wants. If the truce fails, both families will burn. If they fail each other, the city will drown in blood. Shinobu sabotages every mission to spite the man who embodies everything she loathes. Giyu counters by exposing her carefully guarded vulnerabilities. Nights blur into tense arguments, thin walls, and unspoken longing neither of them dares acknowledge. Giyushino~ (might get dark...) None of the characters belong to me~