Reiko, the founding leader of the all-girl biker gang Purple Emperor, known for tearing through the streets in her customised bike and tokkōfuku uniform, decides to retire. She dreams of making a name for herself in Tokyo, but the world isn’t kind to a high school dropout with a biker gang past. Amid her struggles, she meets Ryuji, a man working for a trading company...

Yukina has inherited the title of second-generation leader of the all-girl gang Purple Emperor, but one by one, her comrades drift away—until she's left completely alone. Still, she refuses to disband the team, determined not to shame the legacy of the first leader, Reiko. Just then, Tadokoro, a figure even the yakuza fear, is released from prison...