Pirates: Invincible from the start

(One Piece + Adventure + Hero + Invincible)
Civilians: “Hero, who are you guys?”
Pirates: “Who are you guys? ”
Navy: “Are you guys the ones who want to steal our cloaks?”
Sorata: “Since you’re asking sincerely, I will kindly tell you that in order to prevent the world from being destroyed, in order to maintain world peace,…”
The author yelled: “You guys, have you walked into the wrong theater?”
In fact, this is a story about a time traveler, who takes his childhood sweetheart and a few friends to sail on the sea and adventure as a hero.