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A joint mission ends in a blinding flash of Blood Demon Art, flinging the nine present Hashira fifteen years into a future they were never supposed to see. They crash land straight into a quiet afternoon at the Butterfly Mansion, completely disrupting the downtime of their battle-hardened, heavily scarred successors. Now, the original pillars must face a war-weary generation who grew up in their shadows—including a 22?-year-old Sun Hashira Tanjiro and a unified Triple-Pillar Insect Trio who don't take kindly to intruders.