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Just as the Hinokami Kagura has been passed down through the Kamado family, another ancient ritual has endured quietly within the same bloodline, hidden in plain sight. while the head of the clan journeys into the mountains each New Year to perform the dance from sunset to sunrise, his body pushed to its limits beneath the cold sky, his wife withdraws into the shrine and performs Enmei no Gi (延命の儀), a solitary rite said to grant him the strength needed to endure the night without faltering, a gesture long believed to symbolize a wife's devotion and hope for her husband's safety, yet beneath that gentle meaning lies something far older and far more deliberate, a fragment of a truth that was never meant to be remembered but only passed on......................
When Tanjiro Kamado learned the Hinokami Kagura, his mother also taught him about Enmei no Gi (延命の儀); though he never performed it himself, he came to understand the quiet resolve with which she carried it out each year, a ritual spoken of as an act of devotion, yet one that always seemed to hold a deeper, unspoken meaning-one whose true power he would only begin to grasp when he finally came face to face with its "Shadow"
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The truth behind the Blue Spider Lily and its hidden power begins to unfold when a new force emerges-one that shares the same ultimate goal as the Demon Slayer Corps: the eradication of the anomaly that distorts the boundary between life and death-Muzan Kibutsuji.