The Kawana siblings lost their parents at a young age. The older sister, Airi, graduated from junior college and became an office worker. On the other hand, the younger brother, Tatsuo, liked to play around and didn't study much, but Airi Ke'ai him very much as he was her only family member. One day, Airi gets a call on Airi cell phone from a yakuza named Kawagoe. He says, "Your younger brother has damaged the boss of our gang." Soon, to settle the score, Airi and his men pin Airi down. Furthermore, in front of her fiance, her younger brother betrays her...