Mukai siblings who lost their parents when they were young. My sister Ai continued her efforts and graduated from a junior college and became an office lady. On the other hand, his younger brother Taichi had a playful habit and didn't study hard, but Ai loved his only family, Taichi. One day, a man named Nakata contacts Ai's mobile phone. "Your younger brother scratched my group's mother-in-law." Ai, who was called to make a drop, was overrun by Nakata and others in front of his younger brother, and was forced to have sexual intercourse with his younger brother .... [* The image and sound may be distorted, but please note that this is not a defect of the product itself.]