The World of Suburban Senshi
"Roughly 60% of the population are Samurai. The remaining 40% are Ninja. All Japanese civilians have some experience in Kendo or Judo, and many have mystical powers or overpowered intellects, and half of them are tsundere. 2 out of 10 people you meet on the street will be an alien or demigod." --An exaggerated description of the world of Suburban Senshi... but not by much.