Kyou mo Korosezu ni Aishiau dake.

Kodai Okuhira, is the director of a large corporation. Yukino Miyachi, his excellent and beautiful new secretary, is an assassin on a mission to kill Kodai. The night that she was going to carry out her mission, she makes the mistake that changes her destiny significantly. It is very difficult to fulfill her job as an assassin, when she's newly married to a husband with a great sexual appetite!
(Source: Renta!)