Kyo Kara Hitman [今日からヒットマン]

An ordinary salaryman named Tokichi Inaba who inadvertently becomes involved in the death of a legendary hitman. Facing bankruptcy and saddled with a 35-year mortgage, Inaba is coerced into becoming a hitman himself by the mysterious and beautiful troublemaker Chinatsu, all while trying to keep his new wife Misako in the dark about his double life.