The Usazuki siblings lost their parents at a young age. The older sister, Aika, continued to strive and graduated from junior college, becoming an OL. On the other hand, her brother Masakazu had a habit of playing around and didn't study much, but Aika cherished him as her only family. One day, Aika received a message on her cell phone from a man named Kudou: 'Your brother messed up our boss.' To settle this, Aika was kidnapped by Kudou and subjected to every humiliation imaginable…
