The evil organization Black Hole suddenly emerges, abducting people to turn them into experimental test subjects. Fighting against them in secret are the brother warriors, Justice Bros, with Brother Flare leading the charge. However, a mysterious female scientist named Loveleia appears as a new threat. Central to Black Hole's operations, she is known for her genius-level scientific intellect. Flare battles Loveleia but struggles until his older brother, Brother Shine, joins the fight. Their combined attacks manage to drive Loveleia away, but immediately afterward, Shine is swallowed by a warp hole and dragged to an unknown ruined location. There, Loveleia reappears—revealing the one they defeated was merely a clone. Facing her again, Shine is struck by electric shocks and tormented in his groin, yet ultimately succumbs to her seduction, willingly accepting his role as her test subject. "Now then, I must reward my naughty little lab rat, shouldn't I?" Loveleia says, dominating Shine completely with handjob and blowjob stimulation. Smiling, she whispers, "The experiment was a success. I've gathered excellent data. Hehe, now all that's left is the other one..." As the evil female scientist prepares her next scheme, a new battle looms ahead... [Female Scientist Happy End]