Ryo Saeba is a "sweeper" in the city of Tokyo. He works as a troubleshooter - cleaning the streets of vermin and helping out desperate people. Sometimes he's a bodyguard, other times he's an assassin but whatever Ryo does, he does it well. In fact, his only flaw is his hormones - he loves the ladies maybe a little too much and sometimes turns into an idiot when he's near them! Thankfully, he's got people like his partner, Kaori Makimura to keep him in check.