Okuhira Koudai-san, a rich man, met Miyachi Yukino, an orphan who was raised by a couple whose family trade is to assassinate people, 15 years ago. He did a bg check and asked her hand in marriage but the father refused because she was young. Later she refused thinking he was a maniac. He made himself the target. She didn't know it was a setup. Next thing you know they got married and now he's a happy pervert.
Kyou mo Korosezu ni Ai Shiau dake.