GuessAnime.

1. Saikyou no Ousama, Nidome no Jinsei wa Nani wo Suru?

After a mysterious death, King Grey is reborn as Arthur Leywin on the magical continent of Dicathen. Although he enters his second life as a baby, his previous wisdom remains. He begins to master magic and forge his own path as the years go by, seeking to correct the mistakes of his past life.

The Beginning After the End is finished and has 12 Episodes. It is also Known as: 最強の王様、二度目の人生は 何をする?, TBATE

2. Spirited Away

Stubborn, spoiled, and naïve, 10-year-old Chihiro Ogino is less than pleased when she and her parents discover an abandoned amusement park on the way to their new house. Cautiously venturing inside, she realizes that there is more to this place than meets the eye, as strange things begin to happen once dusk falls. Ghostly apparitions and food that turns her parents into pigs are just the start—Chihiro has unwittingly crossed over into the spirit world. Now trapped, she must summon the courage to live and work amongst spirits, with the help of the enigmatic Haku and the cast of unique characters she meets along the way.

Vivid and intriguing, Sen to Chihiro no Kamikakushi tells the story of Chihiro's journey through an unfamiliar world as she strives to save her parents and return home.

Spirited Away is a Movie. It is also Known as: Sen to Chihiro no Kamikakushi, 千と千尋の神隠し, Sen and Chihiro's Spiriting Away

3. No Game No Life

No Game No Life is a surreal comedy that follows Sora and Shiro, shut-in NEET siblings and the online gamer duo behind the legendary username "Kuuhaku." They view the real world as just another lousy game; however, a strange e-mail challenging them to a chess match changes everything—the brother and sister are plunged into an otherworldly realm where they meet Tet, the God of Games.

The mysterious god welcomes Sora and Shiro to Disboard, a world where all forms of conflict—from petty squabbles to the fate of whole countries—are settled not through war, but by way of high-stake games. This system works thanks to a fundamental rule wherein each party must wager something they deem to be of equal value to the other party's wager. In this strange land where the very idea of humanity is reduced to child’s play, the indifferent genius gamer duo of Sora and Shiro have finally found a real reason to keep playing games: to unite the sixteen races of Disboard, defeat Tet, and become the gods of this new, gaming-is-everything world.

No Game, No Life is finished and has 12 Episodes. It is also Known as: ノーゲーム・ノーライフ, NGNL

4. Sword Art Online

In the year 2022, virtual reality has progressed by leaps and bounds, and a massive online role-playing game called Sword Art Online is launched. With the aid of "NerveGear" technology, players can control their avatars within the game using nothing but their own thoughts.

Kazuto Kirigaya, nicknamed "Kirito," is among the lucky few enthusiasts who get their hands on the first shipment of the game. He logs in to find himself, with ten-thousand others, in the scenic and elaborate world of Aincrad, one full of fantastic medieval weapons and gruesome monsters. However, in a cruel turn of events, the players soon realize they cannot log out; the game's creator has trapped them in his new world until they complete all one hundred levels of the game.

In order to escape Aincrad, Kirito will now have to interact and cooperate with his fellow players. Some are allies, while others are foes, like Asuna Yuuki, who commands the leading group attempting to escape from the ruthless game. To make matters worse, Sword Art Online is not all fun and games: if they die in Aincrad, they die in real life. Kirito must adapt to his new reality, fight for his survival, and hopefully break free from his virtual hell.

Sword Art Online is finished and has 25 Episodes. It is also Known as: ソードアート・オンライン, S.A.O, SAO

5. Re:Zero kara Hajimeru Isekai Seikatsu

When Subaru Natsuki leaves the convenience store, the last thing he expects is to be wrenched from his everyday life and dropped into a fantasy world. Things aren't looking good for the bewildered teenager; however, not long after his arrival, he is attacked by some thugs. Armed with only a bag of groceries and a now useless cell phone, he is quickly beaten to a pulp. Fortunately, a mysterious beauty named Satella, in hot pursuit after the one who stole her insignia, happens upon Subaru and saves him. In order to thank the honest and kindhearted girl, Subaru offers to help in her search, and later that night, he even finds the whereabouts of that which she seeks. But unbeknownst to them, a much darker force stalks the pair from the shadows, and just minutes after locating the insignia, Subaru and Satella are brutally murdered.

However, Subaru immediately reawakens to a familiar scene—confronted by the same group of thugs, meeting Satella all over again—the enigma deepens as history inexplicably repeats itself.

Re:ZERO -Starting Life in Another World- is finished and has 25 Episodes. It is also Known as: Re：ゼロから始める異世界生活, Re: Life in a different world from zero, ReZero

6. Kage no Jitsuryokusha ni Naritakute!

Some people just aren’t suited to playing the part of the flashy, in-your-face hero or the dastardly, mustache-twirling villain with larger-than-life panache. Instead, they operate in the shadows and pull the strings of society through wit and cleverness. That’s the role Cid wants to play when he’s transported to another world. Cid spins a yarn or three and becomes the unlikely leader of the underground Shadow Garden organization that fights against a menacing cult . However, there’s a catch even his wild imagination didn’t see coming: the cult he concocted actually exists, and they’re beyond displeased that his power fantasy just got in the way of their evil plans!

The Eminence in Shadow is finished and has 20 Episodes. It is also Known as: 陰の実力者になりたくて！, To Be a Power in the Shadows!

7. Tensei shitara Slime Datta Ken

Corporate worker Mikami Satoru is stabbed by a random killer, and is reborn to an alternate world. But he turns out to be reborn a slime! Thrown into this new world with the name Rimuru, he begins his quest to create a world that’s welcoming to all races.

That Time I Got Reincarnated as a Slime is finished and has 24 Episodes. It is also Known as: 転生したらスライムだった件, Tensei shitara Slime Datta Ken

8. Tate no Yuusha no Nariagari

Iwatani Naofumi, a run-of-the-mill otaku, finds a book in the library that summons him to another world. He is tasked with joining the sword, spear, and bow as one of the Four Cardinal Heroes and fighting the Waves of Catastrophe as the Shield Hero.

Excited by the prospect of a grand adventure, Naofumi sets off with his party. However, merely a few days later, he is betrayed and loses all his money, dignity, and respect. Unable to trust anyone anymore, he employs a slave named Raphtalia and takes on the Waves and the world. But will he really find a way to overturn this desperate situation?

The Rising of the Shield Hero is finished and has 25 Episodes. It is also Known as: 盾の勇者の成り上がり, Tate no Yuusha no Nariagari

9. Overlord

The final hour of the popular virtual reality game Yggdrasil has come. However, Momonga, a powerful wizard and master of the dark guild Ainz Ooal Gown, decides to spend his last few moments in the game as the servers begin to shut down. To his surprise, despite the clock having struck midnight, Momonga is still fully conscious as his character and, moreover, the non-player characters appear to have developed personalities of their own!

Confronted with this abnormal situation, Momonga commands his loyal servants to help him investigate and take control of this new world, with the hopes of figuring out what has caused this development and if there may be others in the same predicament.

Overlord is finished and has 13 Episodes. It is also Known as: オーバーロード, Overlord

10. Salaryman ga Isekai ni Ittara Shitennou ni Natta Hanashi

The four heavenly kings of the Demon King's army who reign over another world. The person chosen for the last seat was... Dennosuke Uchimura, a dull salaryman! Headhunted by the Demon King's army, Uchimura was offered a position at the executive level, but the Demon King's army's work is a series of tough missions that put his life on the line...?! Uchimura, who has no special skills, faces the challenges of this other world with the experience and wisdom of a salaryman! A story of changing jobs in another world for all working people!

Headhunted to Another World: From Salaryman to Heavenly King! is finished and has 12 Episodes. It is also Known as: サラリーマンが異世界に行ったら四天王になった話, Headhunted to Another World: From Salaryman to Big Four!

11. Kono Subarashii Sekai ni Shukufuku wo! 2

When Kazuma Satou died, he was given two choices: pass on to heaven or be revived in a fantasy world. After choosing the new world, the goddess Aqua tasked him with defeating the Demon King, and let him choose any weapon to aid him. Unfortunately, Kazuma chose to bring Aqua herself and has regretted the decision ever since then.

Not only is he stuck with a useless deity turned party archpriest, the pair also has to make enough money for living expenses. To add to their problems, their group continued to grow as more problematic adventurers joined their ranks. Their token spellcaster, Megumin, is an explosion magic specialist who can only cast one spell once per day and refuses to learn anything else. There is also their stalwart crusader, Lalatina "Darkness" Dustiness Ford, a helpless masochist who makes Kazuma look pure in comparison.

Kono Subarashii Sekai ni Shukufuku wo! 2 continues to follow Kazuma and the rest of his party through countless more adventures as they struggle to earn money and have to deal with one another's problematic personalities. However, things rarely go as planned, and they are often sidetracked by their own idiotic tendencies.

KonoSuba: God's Blessing on This Wonderful World! 2 is finished and has 10 Episodes. It is also Known as: この素晴らしい世界に祝福を！ 2, Give Blessings to This Wonderful World! 2

12. The Devil is a Part-Timer!

Striking fear into the hearts of mortals, the Demon Lord Satan begins to conquer the land of Ente Isla with his vast demon armies. However, while embarking on this brutal quest to take over the continent, his efforts are foiled by the hero Emilia, forcing Satan to make his swift retreat through a dimensional portal only to land in the human world. Along with his loyal general Alsiel, the demon finds himself stranded in modern-day Tokyo and vows to return and complete his subjugation of Ente Isla—that is, if they can find a way back!

Powerless in a world without magic, Satan assumes the guise of a human named Sadao Maou and begins working at MgRonald's—a local fast-food restaurant—to make ends meet. He soon realizes that his goal of conquering Ente Isla is just not enough as he grows determined to climb the corporate ladder and become the ruler of Earth, one satisfied customer at a time!

Whether it's part-time work, household chores, or simply trying to pay the rent on time, Hataraku Maou-sama! presents a hilarious view of the most mundane aspects of everyday life, all through the eyes of a hapless demon lord.

The Devil is a Part-Timer! is finished and has 13 Episodes. It is also Known as: Hataraku Maou-sama!, はたらく魔王さま!, The Devil is a Part-Timer!

13. Overlord IV

The fourth season of Overlord.

Overlord IV is finished and has 13 Episodes. It is also Known as: オーバーロードⅣ, Overlord 4

14. InuYasha

Based on the Shogakukan award-winning manga of the same name, InuYasha follows Kagome Higurashi, a fifteen-year-old girl whose normal life ends when a demon drags her into a cursed well on the grounds of her family's Shinto shrine. Instead of hitting the bottom of the well, Kagome ends up 500 years in the past during Japan's violent Sengoku period with the demon's true target, a wish-granting jewel called the Shikon Jewel, reborn inside of her.

After a battle with a revived demon accidentally causes the sacred jewel to shatter, Kagome enlists the help of a young hybrid dog-demon/human named Inuyasha to help her collect the shards and prevent them from falling into the wrong hands. Joining Kagome and Inuyasha on their quest are the orphan fox-demon Shippo, the intelligent monk Miroku, and the lethal demon slayer Sango. Together, they must set aside their differences and work together to find the power granting shards spread across feudal Japan and deal with the threats that arise.

InuYasha is finished and has 167 Episodes. It is also Known as: 犬夜叉, Inu Yasha