Dantoudai no Hanayome: Sekai wo Horobosu Futsutsuka na Watashi desu ga.

Rinne Irako has been sentenced to execution by guillotine. Host to the powers of a dragon, she has a potential for destruction that endangers humanity. However, a mysterious attacker provides an opportunity that could change her fate. She falls from the sky, right in the path of Ryuunosuke Dazai, who is very eager to help. Luckily, there is a way for him to save both Rinne and the world. All he has to do...is marry her?! With a ring on his finger and a soul bond between them that regulates her powers, his days living with a beautiful dragon girl have begun. (Source: Yen Press)