Shikkaku Mon no Saikyou Kenja~ Sekai Saikyou no Kenja ga Sarani Tsuyoku Naru Tameni Tenseishimashita~ - Chapter 3 Strongest Sage, Hunt Monsters at 6

...[Inside an underground basement]“You are going to die for nothing, hahahaha,” the old man's voice thundered through the room, sending chills down my spine.Step.With a swift and ruthless motion, he lunged forward, his sword slicing through the air and slashing my throat, crimson droplets staining the darkness.“We'll see,” I whispered defiantly, my final words escaping as a mere breath against the impending darkness.Slowly, inexorably, my consciousness slipped away, and I descended into a deep, unfathomable slumber.“Huh!?” My eyes fluttered open, and I found myself seated in a bustling tavern, the air thick with laughter and the clinking of glasses.In front of me stood a captivating lady, her beauty juxtaposed with an angry furrow upon her brow, threatening to shatter the harmony of the jovial scene.“Don't follow me around!” Her words pierced the air like shards of ice, the intensity of her emotions palpable as she cast a resentful glare in my direction, before swiftly departing from the tavern....Am I trapped within the confines of a game? The fragments of my shattered common sense scattered before me, leaving me to question the very fabric of my reality.

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.

Aomori, who has a monster-fighting system, came to the world of One-Punch Man and gained the ability to enter various instances.

Therefore, “Founder of the Hero Association”, “NO. “And other titles fell on him one after another.

Comprehensive flow, the main world One Punch Man.

Completed dungeons so far: Pokémon – Demon Slayer – Sword – Pokémon – Digimon – Spell Return – Yokai Comprehensive World (Girls that Noragami Inuyasha can see, etc.) – Pokémon – One Piece-re0-Dragon Ball wait.

- Description from novelbuddy

After hatching endless plots and suffering innumerable hardships, the demons of the Demonic Realm finally managed to resurrect the Ancient Demon King.

The demons of the Demonic Realm had hoped that the Ancient Demon King would not only lead them in waging a war against the Heavenly Realm and enable them to lord their superiority over the Immortals, he would also ultimately gain control over the entire realm.

Gradually, however, they discovered that their thoughts were very, very wrong.

Whilst it is true that this Ancient Demon King still retains his aura of superiority and possesses unlimited powers, he…

He seems to be a mental case…

It’s alright even if he changes orders and does things in an incomprehensible way.

But what’s with his habit of muttering under his breath, nagging and conversing with himself the entire day!

Small Orchid: He’s not ill, he’s just despicable (贱jian)…can’t stand to see (见jian) people live a good life.

Dong Fang: I am only unable to endure seeing you live a good life.

Small Orchid: …

*T/N: The Chinese pronunciation for the word “despicable” is the same as the word “see” – thus, the author is trying to show that Small Orchid, while trying to scold Dong Fang, is also careful not to incur his wrath, which is why she tried to imbue another meaning into her sentence after scolding him.

- Description from Novelupdates