Two thousand years ago, the Takamahara and Yasuna families waged an endless war. Kayana of Takamahara and Izusami of Yasuna fell in love, which was strictly forbidden, and were forcibly separated. When battle eventually brought them face to face again, Kayana won. Now Kayana has returned to the living world — but without a body. She enters the body of a young woman named Aki, and the consequences of two thousand years of unfinished history begin to unfold.