Manga Sekai No Owari No Encore

A valuable treasure, "Encore," left by the legendary Brave Hero Ellin, contains a record of the end of the world and the reincarnation of the world. Countries and brigades (parties) around the world are looking for its location; age to fight for Encore.
A boy named Ren, who wants to become a knight, has no talent for owning swords, despite the fact that he looks exactly like Ellin the Brave Hero, he had a lifestyle where people taunted him as a "Fake Brave Hero."
The one that appears in front of him is the legendary Dragon Princess Krisha, who woke up from her seal.
She mistakes Ren for Ellin, although she becomes disappointed, as he simply looks like him, but later discovers hidden potential in him. And she invites him on a trip to find Bis along with the Archangel Phia and the Demon Lord Elise, who saved the world earlier.
"Are you sure you want to come with us?" - This is the prelude of wild excitement played by the heroes. The boy, known as the fake Brave Hero, now intersects with the legend!