Haito Diamond ~ volume 1
Alt. title: Ash and Diamond, Hai to Diamond
Author/ artist: SADAHIRO Mika
Otoji is searching for his older brother in seedy, urban Yokosuka. During this search he meets up with Joe, a fashionable prostitute who eventually joins him with his search. Along the way Joe aquaints him with the wonders of sex and prostitution, and the flexibility of being both seme and uke! But while Otoji deals with the search he and Joe face the darker side of their lifestyle.