Asahina Yuri was a crafter of nemuranai of the Crane Clan. Alongside with Kakita Isako, a renowned bladesmith, the two woman sought the unique weapon known as Dragon's Claw Katana, which was in the hands of Daidoji Kedamono's descendant. After several months of careful observation, they fashioned eight copies of the original sword, two for each of the families of the Crane. They took three years to complete the weapons, and the toll was so grat that both were found unconscious the morning after their work was finished. The "patronesses of the blade" had aged 50 years overnight. Those whose actions would dishonor the Crane caused the weapons to bend and warp into useless pieces of metal.