The Devil on G-String is a Japanese adult visual novel. The story revolves around Ky?suke Azai, the adopted son of Gonz? Azai, a yakuza leader. Ky?suke works under Gonz? in order to pay off the sum total of a loan taken out by his biological father and the costs of raising Ky?suke himself under Gonz?'s wing. He eventually hopes to reunite with his mother, from whom he was separated many years earlier. (wikipedia.org).