Kitazawa, a three-no traveler, a mediocre Chunin, taught at the Konoha Ninja School in order to survive to the end. After twenty-one years, he suddenly got a very wrong system. [Congratulations to the host for turning six, the strongest Hokage training system is open. ] "I finally got lucky? Wait, look at my eyes, this is six years old?" [Task 1: Help your deskmate Hinata Hyuga to get back the scarf. ] [Task 2: Graffiti on the Hokage Rock with your classmate Naruto Uzumaki. ] [Task 3: Defeat Uchiha Sasuke and dominate the Ninja School. ] [Task 4: Become the new three ninjas with Naruto and Sasuke, and worship Tsunade as your teacher. ] "Answer me, is it appropriate for a 21-year-old teacher like me to do this kind of task? I won't do it even if I jump from here!" [Task reward: Konoha Uzumaki...

Fatti, transmigrated to the world of DanMachi, starts with a fully-equipped arsenal of three magic spells and seven skills. Unfortunately, his potential is extremely limited, preventing him from seeing further. It's only after accidentally discovering a hidden treasure chest function that his life takes a dramatic turn. He opens invitations to recruit familiars from other worlds, acquiring various magic books and transforming himself from a mage into a noble sorcerer. With the goddess Demeter as his backer, he secretly accumulates strength, manages his familiar, and quietly develops his power. From then on, he cautiously and steadily begins his fantastical life in this other world.

(Not a crossover anime/manga universe, but set in the Akatsuki/Akame ga Kill! universe) "Ichijo, I bestow upon you the Imperial Arm Murasame to commemorate your achievements." "No, too much killing intent, it will harm my health." "What about the Demon Possession?" "No, Lancer's luck is E, how many masters has this thing killed?" "Gaia Foundation?" "I don't want to be a cross-dresser!" "Then what do you want? Tell me, and I will grant it to you." "I want the Demon God Manifestation!" "But, this Imperial Arm is on Esdeath, if you want it, wouldn't you be taking Esdeath home with you?" "Your Majesty is wise, I thank Your Majesty for the marriage!"

The world has inexplicably changed; Mai Sakurajima, Misaki Shokuhou, and Misaka Mikoto suddenly appear. Why can he still connect to another world? The Holy Grail War; the Apocalypse Virus; the labyrinth city of Orario; the Teigu users; "The world is so chaotic, since I've become a demon, I should be cunning, cruel, and tyrannical, that's how it should be..." But these girls before him are not only not afraid of him, but their faces light up with joy upon seeing him; the demon falls into deep thought...

Using the Impure World Reincarnation technique, he was unexpectedly reincarnated into the world of One Piece, becoming the son of Dragon and given the name Luffy. Although the name is the same, his core has changed, and thus his path is different. He initially intended to skip the Devil Fruit and join the Navy, but after unexpectedly encountering the red-and-white-haired princess, he discovered how unfamiliar the world was. How can this be a movie world? How could my King Luffy possibly have a childhood friend and a romantic comedy?

Transmigrating to the ninja world, I awaken a strategy and development system, but as my strength grows, why does it feel increasingly chilly behind my back?

"You're saying I'm special, right?"

"Senior, you gave me hope to live. I will never let you leave again."

"Chenye-kun, let's leave Konoha and go back to the life we ​​had back then, okay?"

Chen Ye: Speak properly, put the knife down first...

...

[Harem] [Battleground] [Daily Life] [Development] [Level Up]

——

[Rocks Pirates] [Multiple Devil Fruits] [Multiple Female Leads] [Battle for Supremacy]

Fang Huo stumbled upon a stroke of luck and traveled to the Ancient Moon Village in the One Piece world. His soul cracked during the time travel, undergoing a special mutation and fusing with the energy of this world to form nine soul worms of the same origin yet independent.

With the first Soul Worm fusing with a Devil Fruit power, a user of nine Devil Fruits was born...

Moon-Light Fruit, Gravity Fruit, Vampire Fruit, Moo-Moo Fruit, Rumble-Rumble Fruit, Azure Dragon Fruit...

With Fang Huo's help, the Rocks Pirates appeared in the world ahead of schedule, possessing an unprecedented ultimate lineup...

Have you ever seen the Rocks Pirates, which included Red Earl, Roger, Rayleigh, and Jabba?

Izumi transmigrates to a world where everyone can convert their past life memories into power in this life. He initially thought transmigrators didn't have past lives, that he was just an ordinary person in his previous existence, but suddenly he gains the powers from the anime he used to watch. First life: Kirito... How could I, Kirito-sama, possibly do gua sha? Second life: ... Third life: ...

Good news, I was killed by a train at home.

Even better news: he's become the navigator of the train.

Even better news is that you can travel to the world of anime by train.

What pioneering and interesting things did you do after becoming a navigator?

She was paired with Kirito.

Adopting Lolis from All Over the World

Discussing the relationship between monarch and subjects with a famous queen

The birth of the king was celebrated with a cannon salute; God was lured onto a train; and Shiori almost fell in love with him.

Do these count?

Worlds experienced: Sword Art Online, Black Bullet, Akame ga Kill!, Date A Live, High School DxD, Guilty Crown, Academy Battle, Accel World...

(P.S.: The world-building is mostly from older anime series, with fewer newer ones.)

[Lighthearted, Semi-Invincible, Multiple Female Leads] For the sake of sales targets, the dump truck had to smash Link into countless parts and send them to various worlds. Having transmigrated to countless worlds, Link has no system, no powerful backer, and can only rely on the shared strength of his countless selves. Naruto World: Kaguya Otsutsuki pulls Link to her side, "Come, Black Zetsu, this is your stepfather." Hogwarts World: Wizards surround Link as the Third Dark Lord. Looking at the Elder Wand shoved into his hand, Link laments, "I never wanted to be Minister of Magic! You've ruined me!" One Piece World: In an interview with the news bird, Link humbly states, "I don't actually have Emperor-level combat power; the three I defeated were just civilian generals." Marvel World: Link: "How can I borrow power from dimensions...?"