Ryo Saeba is a sweeper in the city of Tokyo. His works as a trouble shooter, cleaning the streets of vermin, and helping out desperate people. Sometimes he is a bodyguard, sometimes he is an assassin, whatever Ryo does he does it well. In fact his only flaw is his hormones - he loves the ladies and sometimes turns into an idiot when he is near them. Thankfully he is got people like his partner Kaori Makimura to keep him in check.