The 10 Biggest Harems in Anime

Harem anime are defined by their vast roster of potential romantic partners, and an often male lead who becomes the focal point of multiple women's interest. When Urusei Yatsura all but introduced the subgenre through characters such as Lum and Ataru Moroboshi, it kick-started a niche that has continued to grow over the years in terms of popularity and, occasionally, the number of romantic prospects.

This year, everything from new slice-of-life anime to isekai power fantasies featured a harem dynamic at some point, but each show approached it differently. The one thing they all had in common was their ridiculously massive size. These modern anime joined the already long list of older anime with the biggest and funniest harems fans have ever seen.

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10 Rentaro Aijou Really, Really, Really, Really, REALLY Has 100 Girlfriends

Anime	The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You
Based on	The manga written by Rikito Nakamura and illustrated by Yukiko Nozawa
Number of anime	1 anime
Aired on	October 2023

Aijou Rentarou never had any luck with love, and was rejected by 100 women during junior high. The moment he entered high school, though, his life changed completely. Suddenly, the God of Love revealed himself to Aijou, explaining that 100 girls will fall in love with him over the next year as divine compensation for a clerical error that explained his prior misfortunes. But in a cruel twist of fate, those who fail to become his girlfriends will die.

While this may seem like a dark premise, The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You is a cute and hilarious comedy. Even though Aijou is forced to commit to 100 girlfriends, he genuinely made time for every one of them, making them feel truly appreciated. It's easy to see why 100 girls would fall for Aijou. The anime just began, but it has yet to reveal all of Aijou's 100-strong harem.

9 Tousuke Rokudo Enamored Every Bad Girl He Met in School

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Tousuke Rokudou attended Aomori High, a school for delinquents. Unfortunately, Rokudou was a kind, harmless boy. This led to him being mercilessly bullied by almost everyone in school. One day, he discovered a mysterious scroll his grandfather left him that held a secret power, causing every delinquent girl he met to instantly fall in love with him.

Rather than use this power to benefit himself, Tousuke improved the lives of every bad girl he met. Almost overnight, the school faced far less delinquency. While Tosuke may have a harem, he never took advantage of their feelings or forced them to do his bidding the way most other harem protagonists would. While small compared to other harems, Tosuke was notably one of the few harem protagonists to infatuate all his school's female students.

8 Hiraku Machio Tugged the Entire Village’s Heartstrings

Hiraku Machio reincarnated in another world alone, but with a unique ability that granted him superhuman powers in agriculture. In a short amount of time, he turned an undesirable forest with infertile land and surrounded by monsters into an inviting place to live. His home was now surrounded by bountiful crops, a clean river, and serene solitude.

Unsurprisingly, the interest of anyone who passed through Hiraku's home was piqued, and almost every passerby joined the village. Curiously, they're all women with an interest in Hiraku. As time went by, word of his village spread. Friends and family of villagers end up moving in. Hiraku started off in a new world alone, but now found himself in the middle of an ever-growing harem.

7 Daichi Tanaka Had More Than 80% Of the Fairy Kingdom Chasing Him

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Daichi Tanaka was a 38-year-old man who enjoyed playing VRMMOs (virtual reality mass multiplayer online game) alone during his spare time. Unfortunately, he's a very likable person with a calm, caring, and understanding personality, making him a big hit among players and NPCs in the game "One More Free Life Online." While he wishes to be called "Earth" (the English translation of his name), his friends and other players started using a different nickname: "Fairy Seducer."

During a recent update, the developers introduced companions who can assist players. Earth was a Fairy-type player, and it quickly became apparent that he was so popular among Fairies. However, his profound popularity was a hindrance. The Fairy Queen informed him that he was unable to form a Fairy Contract with just one Fairy as it would cause an uproar among more than 80% of the Fairy Kingdom, who were eager to form a contract with him.

6 Catarina Claes Was Fortune Lover's Most Sought After Bachelorette

Catarina Claes was an interesting harem protagonist. Besides being one of the rare female harem protagonists in the predominantly male genre, Catarina was also interested in both men and women. As such, Catarina attracted the romantic interests of a seemingly endless number of suitors. Catarina's honest, aloof, and humble personality made her an endearing and likable character, and her popularity was easy to understand.

During the anime's first two seasons, Catarina's potential romances included Rafael Walt, Sophia Ascart, Maria Campbell, Alan Stuart and Nicol Ascart. It's expected that she'll only attract more suitors as the anime continues. While Catarina had an array of potential romance options available from all corners of the visual novel Fortune Lover at all times, her one love that never changed was the one she had for sweets.

5 Tenchi Masaki’s Romantic Appeal Attracted 3,000 Suitors From Across the Galaxy & Multiverse

Tenchi Masaki is an average high school student who accidentally released a demon called Ryoko Hakubi after entering a cave. Upon her release, she attracted numerous aliens Princesses, pirates, and more to Earth, each one having their own agendas. Around this time, Tenchi discovered that he wasn't an average human, but an important member of the Jurai Royal Family. Suddenly, Tenchi found himself entangled in these galactic power struggles.

When aliens visited earth, they quickly become infatuated with Tenchi, who was similarly romantically entangled with Ryoko. Throughout Tenchi Muyo!, Tenchi struggled to deal with these numerous romantic encounters, which were constant and relentless. As if Tenchi's prime harem numbering in the thousands wasn't bad enough, its total size didn't factor their multiversal variants yet.

4 Kamijou Touma Won the Affection of Mikasa Mikoto & Her 9,969 Clones

Kamijou Touma has an interesting life. One day, he encountered a clone of his friend and obvious love interest, Mikasa Mikoto, and quickly befriended her. From this point on, he was drawn into a city-wide conspiracy where he learned that an inordinate number of Mikasa clones (aka the Sisters) exist to be killed horribly by Acceletrator.

Touma, with the help of the real Mikasa, stops Accelerator from taking the lives of any more of the Sisters. He then found himself as the object of attraction for the surviving 9,969 Misaka clones and the real one, too, if she's ever honest with herself. This ludicrously large harem doesn't even include his other suitors (i.e. most of the women he met) in A Certain Magical Index and its spin-offs.

3 Dakini Commanded a Harem of 10,000 Fanatical Lovers

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Yukito Urabe, Kamikatu's lead character, died an untimely death caused by his father's religious cult. He then found himself reincarnated in another world where religion doesn't exist. But in a cruel twist of fate, faith becomes an important tool to gain power in this world, as the gods and evil godlike Archons gained strength by having devoted followers.

One of these Archons was Dakini, who ran a hedonistic sex cult that was incredibly popular with Imperial City's citizens. Dakini had more than 10,000 obsessed followers in her cultish harem, making her both well-loved and formidable in KamiKatsu's world. Not only did Dakini have one of the largest harems in anime, but her harem was one of the few historically accurate ones seen in the genre.

2 Reito Mizuhara Was Pursued by the World’s Entire Female Population

World's End Harem pushed the anime harem to its logical extreme. The anime opened with Reito Mizuhara being forced to make a horrifying choice: either he goes into a cryogenic sleep until a cure for his cellular sclerosis is discovered, or face a painful death. Reito understandably chose the former, saying goodbye to his family and the person he loved, Elisa Tachibana.

Unfortunately, when he woke up, the world changed. Due to a seemingly diligent and very narrowly focused virus known as the "MK Virus" (i.e. the Man-Killer Virus), 99.9% of Earth's men died. This left the "heavy burden" of repopulating through procreation on the shoulders of Reito and the very few remaining men. Reito now had a harem that was literally half of Japan's population at least, and the world's entire female population at most.

1 Yukinari Has a Planet-Sized Itch He Couldn’t Quite Scratch

Yukinari Sasaki suffered from a rare medication condition called "Girl Allergy." As a child, Yukinari suffered traumatic abuse involving girls, which now causes him to break out in hives any time he comes in contact with a woman. One day, he found himself transported to another planet called Seiren, populated almost entirely by women. Since men were incredibly rare on Seiren, the entire planet quickly fell in love with the hapless Yukinari.

Not long after his arrival, Yukinari met Miharu Sena Kanaka, whom he quickly befriended. Together, they headed back to Yukinari's home on his original planet. Humorously, many of the girls he met on Seiren later traveled to Earth to move in with him. The lives of Yukinari and his planet's worth of suitors will never be the same.