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.

Despite being adjacent to one another, Chidori Public High School and the all-girls Kikyo Private Academy seem to exist in two different worlds. While the latter boasts an immaculate reputation and favors students from wealthy backgrounds, the former is a nest for dim-witted delinquents. Everyone at Kikyo harbors a deep hatred for their Chidori neighbors. Sixteen-year-old Rintarou Tsumugi is a student at Chidori whose intimidating face leads people to avoid him. Rintarou pays no mind to this, as he is content with his group of friends. However, there is something he has not told them yet: sometimes, he helps out at his family's cake shop. One day at work, Rintarou sees a customer at a table, but she runs off before he can talk to her. The next day, he receives an apology from the girl, Kaoruko Waguri, who explains that she did not run away because of his appearance and that she believes Rintarou is a kind-hearted person. Although he is not used to Kaoruko's bright personality, Rintarou looks forward to forming a friendship with her. There is just one obstacle that stands in his way: Kaoruko is a Kikyo student!

Living in the slums of a wealthy town, Rudo and his foster father Regto try to coexist with the rest of the town's residents, but Rudo despises the wastefulness of the upper class. Ignoring the warnings from those around him, Rudo regularly rummages through the town's garbage in search of anything useful or valuable to save from the "Abyss"—a massive hole where anything considered trash is dumped, including people. Rudo's biological father was one such person, having been thrown into the Abyss after he was accused of murder. One day, after running into a mysterious figure on the way home, Rudo returns to find Regto's dying body on the floor. He is immediately found at the scene by the authorities and is charged with murder. No one believes his claims of innocence, and he is thrown into the Abyss. Instead of dying, however, he finds himself in a strange, foul-smelling place surrounded by monsters made out of trash. When Rudo is attacked by said monsters, he is saved by a man named Enjin, who reveals himself to be a "Cleaner"—someone who uses special weapons called Vital Instruments to combat these creatures. In order to get his revenge on the one who killed Regto, Rudo reluctantly becomes a Cleaner to fight his way back up and out of the Abyss.

In a Victorian world of steam, dreadnoughts, and occult horrors, Zhou Mingrui awakens as Klein Moretti. He walks a razor's edge between light and darkness, entangled with warring Churches. This is the legend of unlimited potential...and unspeakable danger.

Ryou is delighted to be reincarnated into the fantastical world of Phi, where he thinks he'll get to live a quiet life learning to use his newfound water magic. Going with the flow here, however, means something very different. Ryou is immediately pitted against the wild lands he winds up in and the slew of deadly monsters that call the remote subcontinent home. You'd think he'd forget about taking it easy when he's stuck fighting for his life, but lucky for Ryou, he's naturally optimistic, clever, and blessed with the hidden "Eternal Youth" trait. Twenty years pass in the blink of an eye, and each encounter along the way pushes him one step closer to the pinnacle of human magic. Little does he realize that's only the opening chapter of his tale. A fateful meeting soon thrusts Ryou to the forefront of history, forever changing the course of his life... Thus begins the adventures of the strongest water magician the world has ever seen—who also likes to do things at his own pace!

Reeling from her recent breakup, Momo Ayase, a popular high schooler, shows kindness to her socially awkward schoolmate, Ken Takakura, by standing up to his bullies. Ken misunderstands her intentions, believing he has made a new friend who shares his obsession with aliens and UFOs. However, Momo's own eccentric occult beliefs lie in the supernatural realm; she thinks aliens do not exist. A rivalry quickly brews as each becomes determined to prove the other wrong.

Despite their initial clash over their opposing beliefs, Momo and Ken form an unexpected but intimate friendship, a bond forged in a series of supernatural battles and bizarre encounters with urban legends and paranormal entities. As both develop unique superhuman abilities, they learn to supplement each other's weaknesses, leading them to wonder if their newfound partnership may be about more than just survival.

Alicia, who had dreamed of becoming a hero since childhood, is chosen by the king as one of the thirteen heroes. Armed with a legendary sword, the heroes set out to defeat the Demon King Clevatess. However, their recklessness triggers a terrible crisis that could wipe out all of humanity on the continent of Edsea. Now, the world's only hope lies with a baby entrusted to the Demon King.

After a fierce battle, Magic swordsman Kyle finally killed the Demon Lord after being seriously injured in the battle. Kyle on the verge of death approaches a relic which was in possession of the Demon Lord and it sends him to the past. After recovering from the initial shock, he decides to use this opportunity to avoid making the same mistakes of the past and become stronger.