Endou, a night guard, was patrolling the mall as usual. But this night was going to be different from usual...

The love between brother and sister. The love between man and woman. That which is most forbidden is most unyielding. The two sons and five daughters of the Shiunji family shine like brilliant gems, each with intelligence and beauty in equal measure. And with the pedigree of their wealthy father behind them, how could they not be the talk of the town? Eldest son Arata has spent his life being tossed around by the whims of his colorful sisters, yet a little teasing won't stop him from valuing his family over anything and anyone else. But when his youngest sister turns fifteen, their father reveals a long-hidden secret of the Shiunji "siblings" and knocks Arata's world off its axis...

Chu Yue, the ace of the modern Z organization, was framed to death, and under the guidance of the system's Nine Desolation Mirror, his soul traveled to the Nine Desolation World, and under the system's mandatory tasks, he continued to practice and become stronger in order to survive. While performing system tasks and practicing adventures, Chu Yue discovered the shocking secrets hidden in the original owner of the body he was wearing. As Chu Yue unearthed more and more secrets about the original owner of the body, he unexpectedly discovered that he was not the only host of the Nine Desolation Mirror System, but there were other hosts of the Nine Desolation Mirror System in the Nine Desolation World.