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Under the curse of Orochi, the great demon serpent reborn every 300 years, Japan has been shrouded in clouds for as long as anyone can remember... The era of the samurai is at an end, and carrying swords has been outlawed. To combat the rising crime rates, an inescapable prison was built in the middle of Lake Biwa. When brothers Tenka, Soramaru and Chutaro Kumo are hired to capture and transport offenders to their final lodgings in this prison, they unexpectedly find themselves faced with a greater destiny than any of them could have imagined.
Living inside humans, and in the end, inducing the death of its host, the plant that can bloom into an enormous flower, also known as the "Shinigami's Flower", suddenly appeared in the world. It is a "God of Death" that doctors are unable to cure. The only people able to face such overwhelming power are the doctors of Gokurakuen, an medical Institution that travels around the seas. Ichinose Souma, a doctor of Class One in the Gokurakuen who is still unknown, receives a request, and pays a visit to the patients house. He thought it was an easy task, for the infection is still in the early stage, but however...
The period is Kamakura, the age of onmyoudo and monster parades. A child appeared in the shrine by Lake Biwa, Kumou Shrine, asking for help. And then, it's finally time for those two.This is Hirari and Botan's story, finally completed.A story following after Donten ni Warau Gaiden with connection to Rengoku ni Warau.