My brother recommended this manga (comic book) with a very interesting storyline. It is called 13. Here is the story: Mondo Fujieda is in love with a girl named Izayo Gorugo. However, there's a problem: her family are all assassins. He ends up humiliating her and upon this humiliation, she vows to kill him. Luckily for him she moves away. Years later, she comes back to seek vengeance, but what is a guy to do against a skilled assassin?
The first chapter was already translated. It's a good read so far. An underworld character just wants to live a normal life is also tackled in other Asian series like Gokusen (Gangster Teacher), My Boss, My Hero and others. The characters are often mum about their lives and unable to shake off the stigma of being a part of the underworld no matter how hard they resist or ignore it.