Story :  As a yakuza underling, Kosuke makes a living by selling his body to men. Even though he usually leaves quickly after sex, he inadvertently ends up staying with a client until morning. And for some reason, he has absolutely no memories of what happened the night before. His client, Ryoichi, is incredibly handsome... and even after he sees Kosuke's tattoo, he asks to spend another night with him. After hearing a rumor that a drug which makes people's memories hazy during use called pierce has started circulating recently, Kosuke begins to suspect him. However, Ryoichi's overly friendly behavior keeps throwing him for a loop. But Ryoichi, who is actually a detective, is also tracking the source of pierce...