Okkusenman! Okkusenman!

While searching the net, I found a song based off a rockman 2 stage theme, called Okkusenman.

The song is about a man, reminiscing about his childhood and friends, particularly pretending to be Ultraman/Ultra Seven with them, while realizing his life and theirs is nothing like what it used to be.
 

Omoide wa Okkusenman! or, simply Okkusenman translates into : 110 million memories!" or "Countless memories!

various versions of the song can be found on Youtube, 

This being the most popular, while, this being the original version,

If you want he same music video, with the original version, This is what you're looking for.