Heroes Are Extinct!! Bk 01

A hero from a distant star arrives on Earth to pit his strength against Earth's famous superheroes! Only problem is Earth doesn't really have any superheroes. Growing up watching super-hero TV shows from Earth - think Power Rangers or Ultraman, our fearless hero decides to amass an army on his home planet and invade Earth to pit his strength against them. Only when the invasion starts, no one comes to stop him. What is an alien on Earth supposed to do with entire army and no one to fight?!?