The catalog already states the unique clause: anyone who holds the sheathed blade starts becoming Akemura. Kyora almost becomes someone else at the auction. Yura later offers a body. This is not signing. This is overwrite. Enten’s True Realm is this sword’s death because the household was built as a retraction.
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Magatsumi · sheath
The sheathed bypass鞘
A masterpiece you should not pick up.