Synopsis
An animated pilot film for Band of Ninja released to the public over three decades later on The Legend of Ninja Kamui DVD volume 7. The pilot film was created in 1969 as director Nagisa Ōshima was wanting to make a TV animation to build off his controversial film from 1967. The pilot was rejected by Shirato himself (the original comic creator the film was based on) and the plan was changed to animate Kamui Gaiden instead, a side story to the Kamui manga also created by Shirato. Though with this change, Ōshima did not partake in The Legend of Ninja Kamui's production.
You might also like

2500 years ago, in India, Siddhartha was born as a prince of the Shakya clan, but he gives up his position as a prince to see the world. He meets a strange boy named Assaji, who can predict the future, a monk with only one eye and Depa. Siddhartha continues traveling. Siddhartha is overwhelmed by the sufferings he witnesses around him. Meanwhile, Prince Ruri of Kosara begins his attack on the Shakya clan. Second Buddha movie from Tezuka Productions.
Buddha 2: The Endless Journey

The second part in a two-part anime film project adapting the "Sixth Singularity - Divine Realm of the Round Table: Camelot" story from the game.
Fate/Grand Order the Movie: Divine Realm of the Round Table: Camelot 2 Paladin; Agateram

The stand-alone pilot OVA which was shown as part of the "Jump Super Anime Tour" of 1998. Shortly before the TV series, a summary is presented of the story of Gon who wants to become a hunter and the friends he makes in the process.
Hunter × Hunter Pilot

The wandering knight, Bedivere, reaches the end of his journey. It is A.D. 1273 in Jerusalem. The Holy Land has been transformed into a massive desert and its people have been forced out of their homes as three major powers wage war with each other in this wasteland. The Knights of the Round Table come together to protect the Holy City and their Lion King. With the whole of his kingdom summoned into a strange land, Ozymandias, the Sun King, quietly plots against the tyranny of this bizarre realm. The mountain people, protectors of those who were stripped of their land, await their chance at rebellion. In order to fulfill his mission, Bedivere heads for the Holy City where the Lion King rules. There he meets humanity’s final Master, Ritsuka Fujimaru, who has come to Jerusalem, accompanied by his Demi-Servant, Mash Kyrielight, in their quest to restore human history.
Fate/Grand Order the Movie: Divine Realm of the Round Table: Camelot 1 Wandering; Agateram

A hand drawn animated short by Studio Ghibli.
Zen - Grogu and Dust Bunnies

Prince Siddhartha is heir to the Shakya kingdom, which is constantly at war with the more powerful Kosala kingdom. His father tries to raise as him as a warrior leader and to shield him from the miseries of the world. Meeting the young outcast girl Migaila, Siddhartha experiences love for the first time but also witnesses the suffering that afflicts humankind. Meanwhile, in Kosala, Chapra rises through the military, despite his lowly origins, to become a hero and general of the army. A final showdown between the two kingdoms forces Siddhartha to re-evaluate the path he is following.
Buddha: The Great Departure

The human resistance works to convert a sentinel to their side. Part of the Animatrix collection of animated shorts set in the Matrix universe.
Matriculated

Naruto faces off against his old pupil Konohamaru in a tournament during the chuunin entrance exams.
Naruto OVA 9: Chunin Exam on Fire! and Naruto vs. Konohamaru!

Doraemon and its friends open a hole in the time and they're travel to the Country of Mayana, a lost Mayan civilization in the jungle.
Doraemon: Nobita and the Legend of the Sun King

In an age of revolution, Marie Antoinette and her protector Oscar François de Jarjayes face tough choices as women growing into their distinct roles.
The Rose of Versailles

The Straw Hats visits an island, known as Mecha Island, where a fisherman sings an old folk song about a Golden Crown. Searching for that mysterious treasure, they find a hidden entrance into the island. The island's leader, Ratchet, impressed with the find and in search of the Golden Crown himself, invites the crew to join him in his search and the crew along with Ratchet and his henchmen enter the cave. As it turns out, the islands true form, is that of a giant turtle. Ratchet, who had known this all along, uses his mechanical castle to take control of the turtle, in order to use it, to take over the world. Now the Straw Hats have to stop not only Ratchet, but also the helpless turtle, from crashing into a nearby island.
One Piece: Giant Mecha Soldier of Karakuri Castle

The film's plot follows that of the game closely. Nariko, a member of an ancient tribe who have guarded an ancient magical sword for thousands of years, is charged with bringing the sword to its destined wielder, a deity reincarnated who will bring peace to the land. But on her quest, Nariko must wield the sword herself against the forces of King Bohan, who wishes to possess the weapon himself.
Heavenly Sword

As Nobita, Gian, Shizuka, and Suneo are making their own space movie, a fleeing bug-sized alien president makes his way to Earth, and needs the help of the kids and Doraemon to stop an oppressive dictatorship threatening his democracy.
Doraemon: Nobita's Little Star Wars

Tanjiro ventures to the south-southeast where he encounters a cowardly young man named Zenitsu Agatsuma, a fellow survivor from Final Selection. His sparrow asks Tanjiro to help keep him in line. A recap of Kimetsu no Yaiba episodes 11–14, with new footage and special end credits.
Demon Slayer: Kimetsu no Yaiba - Tsuzumi Mansion Arc

Promotional video celebrating 20 years of the Naruto animation project.
Naruto 20th Anniversary - Road of Naruto

Everyone's favorite TV superhero Action Mask shows up in Kasukabe, and he's trying to get something from Shin-chan -- but what could it be?
Crayon Shin-chan: Action Mask vs. Leotard Devil

Nobita travels to the future to show his beloved grandma his bride, but adult Nobita has fled his own wedding.
Stand by Me Doraemon 2

Batman, along with many of his allies and adversaries, finds himself transported to feudal Japan by Gorilla Grodd's time displacement machine.
Batman Ninja

After failing to avenge her father's murder, Princess Scarlet, wakes up in the "Land of the Dead." In this world filled with madness, if she does not achieve her revenge against her nemesis and reach the "No End Place," she will become "Void" and cease to exist. Can Scarlet find a way to live at the end of her endless journey?
Scarlet

In the underground Diamond Domain, where many Carbink live, the Mythical Pokémon Diancie serves as ruler. The Heart Diamond that sustains the land is beginning to fall apart, and Diancie is not yet strong enough to create a new one. While seeking help from the Legendary Pokémon Xerneas, Diancie encounters a group of thieves who want to take control of its diamond-producing power–and who awaken the Legendary Pokémon Yveltal from its cocoon in the process! Can Ash and his friends help Diancie discover its true power, stop Yveltal’s rampage, and save the Diamond Domain?