The third season of Mushoku Tensei: Isekai Ittara Honki Dasu.

The Adrasia empire on the Vogel continent. There is a battle over the throne of such an empire that possesses powerful military and vast territory. With the successor undecided, the children of the emperor are vying to expand their power. However, there was one prince that everyone says will definitely not become the emperor: the seventh prince, Arnold Lakes Adler. The young man who was inferior to his younger twin brother in every way, the dull prince. Incompetent and lethargic, Arnold wastes everyday just playing around. However, behind the scenes, he is one of the only five SS-Class adventurers called "Silver." Seeing the intensifying battle for the throne he decided "I don't want to die, so let's have my little brother become the emperor..." This is the tale of absurd secret maneuvers of the prince who is uninterested in the title of the emperor. (Source: Shousetsuka ni Narou, translated)

Gold Roger was known as the "Pirate King," the strongest and most infamous being to have sailed the Grand Line. The capture and execution of Roger by the World Government brought a change throughout the world. His last words before his death revealed the existence of the greatest treasure in the world, One Piece. It was this revelation that brought about the Grand Age of Pirates, men who dreamed of finding One Piece—which promises an unlimited amount of riches and fame—and quite possibly the pinnacle of glory and the title of the Pirate King.Enter Monkey Luffy, a 17-year-old boy who defies your standard definition of a pirate. Rather than the popular persona of a wicked, hardened, toothless pirate ransacking villages for fun, Luffy's reason for being a pirate is one of pure wonder: the thought of an exciting adventure that leads him to intriguing people and ultimately, the promised treasure. Following in the footsteps of his childhood hero, Luffy and his crew travel across the Grand Line, experiencing crazy adventures, unveiling dark mysteries and battling strong enemies, all in order to reach the most coveted of all fortunes—One Piece.[Written by MAL Rewrite]

I met my childhood friend again, and she had become a beautiful and innocent girl."It's been a while, Hayato.""Haruki, is it?"In the past, I used to play in the mud with my childhood friend in the countryside, and when I saw him again, there was no trace of the bratty young man I thought he was back then. Only in front of Hayato, she threw away the coat she was wearing and reacted in the same crass way she did back then. The distance between you and me has not changed.(Source: Shousetsuka ni Narou, translated)

Seventeen-year-old Jirou Azuma lives a quiet life with his grandfather, utilizing his supernatural ability to speak with animals to befriend and protect them. Both Jirou and his grandfather are descendants of a long-standing shinobi clan, training in combat to keep the art of battle alive within their family. Jirou's life is thrown into upheaval after rescuing a seemingly normal black cat, Ragou, only to discover that the cat is actually a mononoke—a demonic spirit that has long been at war with mankind. When a hostile mononoke comes looking for Ragou, Jirou uses his shinobi training to jump to the cat's defense, but immediately suffers a mortal wound.Faced with the decision of whether or not to devour Jirou's fading energy and restore himself to full power, Ragou instead chooses to give his remaining energy to Jirou. Reviving the boy, the transfer also grants him great supernatural powers that complement his own shinobi fighting style. This act is witnessed by Ryousuke Shiba, an officer in the Bureau of Espionage whose job revolves around dispatching aggressive mononoke. Shiba extends Jirou and his grandfather an offer: to join the Bureau's new squad, Black Torch, and help them battle powerful mononoke who seek to devour innocent people.[Written by MAL Rewrite]

Demon Lord Rimuru's dream of creating an alliance between humans and monsters takes a step closer to being realized. As Tempest continues to prosper, Granville Rozzo and his granddaughter, Maribel Rozzo, clash with Demon Lord Rimuru over their plan to protect mankind by ruling over them. Meanwhile, in El Dorado, Demon Lord Leon works toward goals of his own. The awakening of a new Hero draws near!