Kagerou

Kagerou is a dangerous suling beauty tormented by her unfortunate curse. Whenever she makes love her breath turns into a poisonous mist, which enters her lover's lungs and kills him. In a horrible twist of fate, Kagerou falls in love with Gennosuke. Of couse, she may never persue her feelings for him and as a result, she harbors an enormous amont of hatred towards Oboro. (Source: FUNimation's Official Basilisk Website)