Guillotine Bride, Vol. 2 (manga) : I'm just a dragon girl who'll destroy the world.

Ryuunosuke Dazai and Rinne Irako’s souls have now been linked. But even as they live their new life together and deepen their bond, the tragic fate of all mythical girls casts its shadow over them… As a horrifying plot is put into motion, will they be dragged into an abyss of despair?!