Abyssal Chronicles - Chapter 942 - 943: Encounter Battle part 2

Ron finds himself reborn in the world of One Piece, stranded on a remote island in the East Blue. But he's not just any ordinary child—he’s bonded to a mysterious sign-in system that grants him powers with every new location he visits.At his first sign-in, he unlocks the legendary Sun Breathing Technique, along with a boost to his vitality. From Shitmotsuki Village to Skypiea, Enies Lobby to Marineford, Ron travels the world, collecting extraordinary rewards that make him a force to be reckoned with. The Raikiri, one of the 21 Great Grade Swords, Armament Haki, Observation Haki, and more fall into his hands.As Ron steps onto the battlefield of Marineford during the legendary Summit War, the mightiest warriors—Four Emperors and Marine Admirals alike—pause, stunned by his presence. But Ron merely waves them off, “Don’t mind me. I’m just passing through.”Join Ron on his journey across the Grand Line as he signs in at iconic locations, growing stronger with every step. This is not just an adventure—it’s a legend in the making.

Four years ago, the first-ever Armageddon Class Anima appeared on Earth, destroying everything that it touched and threatening the lives of the entire world's population! But along with it came Superhumans that had the blessing of mana. They rose up to fight against the Armageddon, and leading them was the strongest Superhuman, KING.After two days and three nights of nonstop battle, KING gave his life to stop the Armageddon and give the Superhumans a fighting chance against the invading Anima, and everyone in the world remembers his good deeds and sacrifice!...Mark was just an average Superhuman living in City A. His daily routine was skipping classes and hanging out with his only two friends while hunting for Anima in secret whenever he could. But this easy life was not going to last for long as the hidden power he sacrificed a long time ago began to awaken once more![Initializing Superhuman System...][Recognizing Host... Host Recognized.][Parsing Constitution. Host Fully Healed. No Traces Of Residual Damage.]“Hello once again, Mark Vanitas. Has it already been four years?”

Three Days of Happiness is a novel by Sugaru Miaki, also known as Fafoo. It’s a rewritten version of the story originally posted to 2ch.

The premise of the story revolves around a shop where one can sell away the remaining years of their life, and the consequences of doing so.

“I Say A Little Prayer” is a short related story which was posted along with the novel’s release. It spoils some things about the main story, but nothing major.