For Elle, a young woman with a troubled past, this is a holy mission, to rid the Earth of the Yonis, supernatural beings that live among the people. With exceptionally sharp reflexes and wielding a katana – the long, curved samurai sword – she is driven on by her deep hatred for them. It seems that nothing and no one can stop her.
Yet everything changes when she crosses paths with Koan, a strange, attractive character endowed with unbelievable powers. He proves a formidable opponent for the young woman, especially since he seems to know about her past and be able to guess her weaknesses.
Will she risk making a pact with the enemy to find out what lies behind her troubled visions of the past? Will she resist the attraction she feels to Koan, despite their differences? The consequences might be terrible.