Believe!

Once upon a time, the demon lord attacked the hero's country. Everything fell apart! The hero, the hero's party, the adventurer's guild, the country army, the royal secret assassins, everything! In desperation, the hero fled the battlefield to chase a vague rumour:

The strongest hero (different person, not to be confused with the hero) is still alive and lives in a very remote area.

The hero searches far and wide, chasing shadows and ghosts, until he finally reached the strongest hero's residence, only to be blocked by a group of fighters.

The hero: Let me pass, I need to ask the strongest hero for help!

Fighters leader: No! None shall pass, this is the absolute order of the strongest hero to us, his fan club! He does not want to be disturbed by anyone, not even his wife can pass! 

The hero: Don't make me kill all of you to reach him! 

Fighters leader: Less words, more wounds.

The hero fought them bravely, defeating them all and reaching the strongest hero's home. He went in and found the home empty.

The hero: Why is the place empty? Where is he?

Fighters leader appears from behind the hero, limping and injured: That is because the strongest hero is me all along! You are the strongest hero now after defeating me!

Shocked and overjoyed, the hero left and proceed to defeat the demon lord with his new found belief.

After the news of the hero's victory reached the strongest hero's home:

Fighters leader: Your plan worked, my lord. He only needs a little push to unlock his ultimate skill.

The actual strongest hero: Nice! Well done, men! Good thing I taught all of you enough that he failed to kill anyone. Now I can ACTUALLY live in peace.

The end.