Kawana siblings who lost their parents when they were young. My sister Airi graduated from junior college and became an office lady. On the other hand, his younger brother Tatsuo had a playful habit and didn't study hard, but Airi loved his only family, Tatsuo. One day, a yakuza named Kawagoe contacts Airi's mobile phone. "Your younger brother scratched my group's mother-in-law." Eventually, Airi is laid down by Kawagoe and others in order to make a drop. Furthermore, due to the betrayal of his younger brother, even in front of his fiancé ... [* The image and sound may be distorted, but please note that this is not a defect of the product itself.]