Aonagi Miki, also known as Bird Blue, has stood at the heart of Bird Five, fighting against evil conspiracies. One day, while training alone with her commander during their day off, they are suddenly attacked by soldiers from the evil organization Egostar. Miki single-handedly battles the soldiers, struggling fiercely but eventually defeating them. Immediately afterward, she is ambushed and captured by Dark Gynos, a high-ranking Egostar officer. Attempting to extract the location of the secret base from her, Dark Gynos is met with complete silence. Enraged, he subjects Miki to a human experiment using forbidden technology. The experiment succeeds— an alien penis is surgically grafted onto her body. This implant delivers overwhelming waves of intense pleasure and pain unlike anything she's ever experienced. Designed with repeated refinements, it forces her to ejaculate again and again without relief. As Egostar soldiers relentlessly pump and abuse her new organ, just how long can Bird Blue endure before losing her sanity?