Silence (Akiyama Koito)

Rebirth (ch.1-3): Zenji finds out he has a terminal illness called VEB and has to retire from his SIS job. As he walks home, depressed, he runs into a boy who asks him to protect him in exchange for money. Silence (7-10): Luca Angeli was born without a voice, but as he grew to have a beautiful features, his parents sold him to the mafia, where he has been living as a (sex) toy. One day, his cruel owners were taken down by Shion, a mafia hitman with mysterious powers, and he was freed. However, with nowhere to go, Luca could do nothing bur remain where he was, thinking of his stoic-looking, taciturn savior...