Official Introduction: Now approaching you is: Muzan's nightmare, the destroyer of the Twelve Demon Moons, the head of the Infinity Castle demolition office, the most righteous person in the Demon Slayer Corps, Sabito's savior, the eternal absentee of Kanae Kocho's tea party, Giyu's good senior brother, the founder of Fist Breathing, and a grandmaster.

Willow branches provide shade, that's it!

Kanae Kocho: "I invited him to a tea party ninety-seven times, and he refused ninety-seven times. He's so gentle."

Shinobu Kocho: "Why should I be trained by iron fists? It's infuriating, sister!"

Akaza: "A powerful person, the best in physical combat."

Muzan Kibutsuji: "A monster who destroyed all my Demon Moons with his bare hands and blasted the Infinity Castle to pieces, you call him human?!"

Unofficial synopsis: Yagyu In transmigrates to the world of Demon Slayer, but the system believes he is in the world of One Piece and identifies him as a Marine.

You can earn Navy Points and rewards by doing things that are in line with the Navy's rules.

Yagyu In: No, buddy, is this right? Where did this pirate from the Demon Slayer world come from that I need to catch?!

Pirates are attacking! Strike immediately to capture or kill them!

Looking at the man-eating ghost before him, Liu Shengyin realized that the system had gone mad.

From then on, the Demon Slayer Corps had one more instructor who liked to smash people's heads with his iron fist of love.

This book is also known as "Left Fist's Overpowering Entanglement Deals High Damage, Right Fist's Overpowering Entanglement Deals High Damage," "Three Punches Shatter Evil Spirits, Sir, I'm Just an Ordinary Person," "Overpowering Aura is Also Qi, and Qi is Breathing Technique!" and "Muzan, Are You Hiding Well? The Marine Admiral is Coming to Get You~"

Note: This book is a crossover anime/manga series, and will later explore other worlds.

"Kid the Phantom Thief, known as the Gentleman Thief, the Magician of the Moonlight, the Man of Miracles… yet no one knows his true face. His name, age, height, even gender are a mystery. He is the most enigmatic figure in the world." — Gotham Gazette "Gotham, Metropolis, Star City, Central City, Seaside City… Kid the Phantom Thief's footprints are all over the world. Almost every well-known superhero has tried to capture him, but none have succeeded, not a single one!" — Daily Planet "I used to think Kid the Phantom Thief was just a simple thief, but I was wrong. His abilities are complex and unpredictable. His motives remain unknown. He may not be a bad person, but his unpredictability could have very dangerous consequences." — Batman "I admire him, but…"

What to do when you're out at sea without a ship? Allen: "Steal someone else's." What to do when there's no one on board? Allen: "Dig someone else's." What to do when there are people but no supplies? Allen: "Rob a warship." Treasure, famous swords, Devil Fruits, where do the women come from? Allen: "Brothers, look! There's a transport ship that's practically floating on air, it has everything!"... Transmigrating to the world of One Piece, relying on Baki's cheat abilities to rise to power in the East Blue, starting with just his fists, he steals everything—people and ships. My name is Allen, and I advocate for freedom. (A million-word completed high-quality One Piece fanfiction is already available; readers are welcome to jump in and get crazy!)

[Peerless Tang Sect] + [Anti-Three Abuse] + [Fatherly Love, Daughterly Filial Piety] + [Aizen] + [Unsung Boss] Shrek City. Heartbroken, Moon and Xuanzi stared intently at Aizen, who stood high in the sky. "Aizen! Turn back now, everything can still be salvaged!" Aizen, rising slowly within the anti-membrane, looked emotionlessly at the suffering Huo Yuhao, Wang Dong, and the elders of the Sea God Pavilion below. "This world is sick—history has been distorted beyond recognition, good and evil are blurred. From this moment on, the so-called empire will be wiped out, the so-called gods will be torn down from the altar, and this window of opportunity for the throne of heaven will also end." With this, Aizen removed the black-framed glasses that concealed his ambition. "From now on, I will stand in the sky."

On a street in Tokyo, three or five people were lying on the ground, covered in blood and wounds. Two people stood among them, standing out from the crowd.

A man covered in scars was lying on the ground. He threw the dagger in his hand to the blond man in a black cloak standing beside him and said with lifeless eyes.

"Come on, Manjiro, kill me!"

The standing man's eyes narrowed and he spoke.

"I won't kill anyone, today..."

But before he could finish his words, he was interrupted by the man on the ground.

"If you kill me today, everything will be resolved. You don't seem to be an adult yet, so you'll only spend a few years in jail. But if you don't kill me... over there, do you see that gasoline barrel? I brought it today to dispose of the body. If you don't kill me now, that barrel of gasoline will be poured at your doorstep tonight... Or maybe even in your house, on you, your father, your mother... Hahahahahahaha..."

As the injured man on the ground spoke, his expression became more ferocious and his voice became more perverted.

The man standing aside looked increasingly unhappy. He turned to look at the other men lying on the ground, their limbs crippled and completely unable to move. He didn't understand how these people had gotten into trouble with this man, who also seemed to have some mental issues...

While the man named Wanjiro was hesitating, another man beside him stepped forward, picked up the dagger, and looked down at the man on the ground with an increasingly fierce look in his eyes. Just as he made up his mind and slowly raised his hand.

A loud roar came from the intersection.

"Stop! Don't move! I'm Officer Murashita of the Tokyo Metropolitan Police Department. Drop your weapon immediately! Hold your head and squat!"