Read Kyou kara Hitman Manga:
On his right, his index finger on a trigger. On his left, a wedding ring. That is Tokichi's new life. A shy and clumsy salaryman, forced to become a hitman overnight. A double life: bowing during the day and gunfighting at night.
He also has to juggle the two women in his life: his domineering wife and the jealous girlfriend he has inherited as his secret persona.