10 Forbidden Anime Like High School DxD: The Ultimate Supernatural Harem & Action List For 2025

Are you searching for an anime that perfectly blends intense supernatural action, a deep fantasy lore, and the unapologetic fan service of a massive harem? Since its debut, High School DxD has set the gold standard for the "action-harem-ecchi" genre, primarily through the journey of Issei Hyoudou and his devil peerage. Finding an equivalent series that hits the same notes of power-ups, comedy, and explicit character interactions can be a challenge. However, as of December 17, 2025, the anime world continues to deliver shows with similar high-stakes battles and compelling romantic dynamics.

This deep-dive list compiles the absolute best and most current anime recommendations that capture the spirit of High School DxD, from direct plot parallels to the newest 2024/2025 releases that push the boundaries of the genre, ensuring your next binge-watch is packed with supernatural excitement and plenty of fan service.

The Core Trinity: Supernatural Harem & Action Powerhouses

The magic formula of High School DxD is the potent combination of a male protagonist gaining immense, often perverted, power, surrounded by a diverse cast of supernatural female allies. These three anime are the closest spiritual successors, nailing the supernatural setting and the action-to-ecchi ratio.

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1. The Testament of Sister New Devil (Shinmai Maou no Testament)

This series is arguably the most direct and intense parallel to High School DxD. The premise revolves around high school student Basara Toujou, whose father suddenly brings home two beautiful stepsisters: Mio Naruse, a newly revealed Devil, and Maria Naruse, her succubus servant.

Why it's like DxD: Basara, like Issei, is a seemingly ordinary boy who is secretly a powerful warrior (a member of the Hero Clan) tasked with protecting a Devil. The series features a similar master/servant contract dynamic, constant battles against rival factions (Heroes, Spirits, and other Devils), and a level of fan service that often surpasses DxD in its explicitness and intensity.

• Genre Blend: Ecchi, Action, Supernatural, Harem, Fantasy.
• Key Entity Similarity: The protagonist has a powerful, hidden ability (Basara's Banishing Shift) that grows through his bond with his harem members, mirroring Issei's Boosted Gear.

2. Demon King Daimao (Ichiban Ushiro no Daimaou)

The story follows Akuto Sai, a transfer student who arrives at a magical academy with the goal of becoming a high-ranking priestess for the good of society. However, a prophecy reveals his future path: he is destined to become the Demon King.

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Why it's like DxD: The central conflict is the same—a reluctant male protagonist is thrust into a position of supernatural power and is immediately surrounded by a group of powerful, beautiful girls who either want to serve him, kill him, or both. The series is a classic example of the action-comedy ecchi genre, featuring complex magic systems and frequent, humorous fan-service moments that break up the serious battle sequences.

• Genre Blend: Comedy, Action, Magic, Supernatural, Harem.
• Key Entity Similarity: Akuto's destiny and immense, uncontrollable power parallel Issei's struggle to control the Red Dragon Emperor's power while dealing with his growing harem.

3. Chained Soldier (Mato Seihei no Slave)

One of the newest entries to the genre, Chained Soldier (or Mato Seihei no Slave), premiered in 2024, offering a fresh take on the action-ecchi formula. The world is threatened by monsters from an alternate dimension called Mato, which can only be entered by women who gain superpowers from the dimension's unique peaches. Yuuki Wakura, the male protagonist, is pulled into Mato and finds himself bonded to Kyouka Uzen, the beautiful commander of the Anti-Demon Corps, as her "slave," who gains immense power when transformed by her.

Why it's like DxD: It perfectly updates the core concept: a male hero who needs a beautiful female partner to unlock his true power. The power-up mechanism is directly tied to the ecchi/fan service element, much like Issei's "Pervy Power" in DxD. It has a high-quality, modern animation style and a strong focus on action against monstrous threats.

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• Genre Blend: Action, Fantasy, Ecchi, Harem, Superpowers (New for 2024/2025).
• Key Entity Similarity: Yuuki's power is activated by a reward from Kyouka, a direct thematic parallel to Issei's Pawn promotion system under Rias Gremory.

When Action Meets Pure Fan Service: The Harem Focus

While DxD is famous for its action, many fans are drawn to the pure harem and comedy elements. These titles prioritize the fan service and romantic comedy aspects while still maintaining a supernatural or sci-fi setting.

4. The Heaven's Lost Property (Sora no Otoshimono)

The series centers on Tomoki Sakurai, a perverted but peace-loving high school student whose life is turned upside down when a beautiful, winged girl named Ikaros falls from the sky. She is an Angeloid—a powerful, sentient weapon—who declares herself his servant.

Why it's like DxD: It's a classic supernatural comedy-harem with a protagonist who frequently finds himself in compromising situations. While the action is less frequent than in DxD, the emotional bonds, comedy, and sheer volume of fan service are on par. It’s a foundational series in the ecchi-harem subgenre.

• Genre Blend: Comedy, Sci-Fi, Harem, Ecchi, Supernatural.
• Key Entity Similarity: The theme of a protagonist suddenly becoming the master of powerful supernatural beings (Angeloids) is a mirror to Issei's role as the Servant of the Gremory household.

5. To LOVE-Ru (To LOVE-Ru Darkness)

Rito Yuuki is a normal high school boy who is hopelessly in love with Haruna Sairenji. His life is complicated when Lala Satalin Deviluke, the runaway princess of the planet Deviluke, crash-lands in his bathtub and decides he must marry her.

Why it's like DxD: The title is a cornerstone of the modern ecchi-harem genre. While the focus is more on romantic comedy and slice-of-life, the presence of alien royalty, assassins, and supernatural powers (especially in its sequel, To LOVE-Ru Darkness) provides the necessary fantasy elements. It is the perfect series for fans who prefer the comedy and character interactions over the battle sequences.

• Genre Blend: Sci-Fi, Comedy, Harem, Ecchi, School.
• Key Entity Similarity: Lala is a Devilukean, a race with "devil" in their name, creating a thematic link to the Devils and Underworld of DxD.

6. Harem in a Labyrinth in a Fantasy World (Isekai Meikyuu de Harem wo)

This is a recent (2022) isekai entry that has gained massive popularity for its uncompromising focus on the harem element. Michio Kaga, a despondent high school student, finds himself transported to a fantasy world where he can use a video game-like system to build his party and, more importantly, his harem of slave girls, starting with the beautiful Roxanne.

Why it's like DxD: It trades the supernatural school setting for a pure fantasy/isekai setting but maintains the core loop of a male protagonist gaining power and forming intimate bonds with his female companions. It is one of the most explicit and dedicated harem series released in recent years, making it a must-watch for fans who value the ecchi and relationship development above all else.

• Genre Blend: Isekai, Fantasy, Ecchi, Harem, Adventure.
• Key Entity Similarity: Michio's ability to "rank up" and gain new skills in his party is structurally similar to the Evil Piece System in DxD.

The Darker & More Mature Alternatives: Supernatural Action

If you enjoyed the darker fantasy elements, the mythology, and the intense action of DxD, these titles offer a more serious or controversial edge.

7. Rosario + Vampire

Tsukune Aono, a human boy, accidentally enrolls in Yokai Academy, a school for monsters. He must keep his human identity a secret, all while a powerful vampire, Moka Akashiya, becomes obsessed with him, leading to a sprawling harem of other monster girls: a succubus, a witch, and a snow woman.

Why it's like DxD: It features a high school setting where the supernatural is the norm, and the protagonist is the "odd one out." It balances monster-of-the-week action with a growing harem, though it leans more into the monster mythology and transformation tropes. The action sequences involving Moka's true vampire form are reminiscent of Issei's Juggernaut Drive power-ups.

• Genre Blend: Supernatural, Harem, Comedy, School, Vampire.
• Key Entity Similarity: The protagonist is constantly protected and empowered by his monster-girl harem, a clear parallel to Issei's relationship with Rias and Akeno.

8. The Qwaser of Stigmata (Seikon no Qwaser)

This series is infamous for its unique and controversial source of power. It follows Alexander "Sasha" Nikolaevich Hell, a Qwaser, a being who can manipulate chemical elements based on a specific, non-traditional form of fan service. He is drawn into a conflict over a powerful icon, the Theotokos of Sidon.

Why it's like DxD: It is pure, unadulterated supernatural action and ecchi. If you are looking for a series that is as bold and explicit as DxD, and perhaps even more controversial in its power mechanics, this is a must-see. The action is brutal, and the supernatural lore is surprisingly deep, making it a compelling, if polarizing, watch.

• Genre Blend: Action, Supernatural, Ecchi, School, Mystery.
• Key Entity Similarity: The entire premise is built around a male protagonist's perverted actions directly fueling his immense battle power, which is the foundational concept of Issei Hyoudou's character arc.

Honorable Mentions for Supernatural Harem Fans

These final two series are beloved by the community for their strong genre ties and offer a slightly different flavor of the action-harem mix.

9. Yuuna and the Haunted Hot Springs (Yuragi-sou no Yuuna-san)

Fuyuzora Kogarashi, a psychic high school boy, takes a job as a live-in ghostbuster at a haunted hot spring inn, Yuragi-sou, to save money. The "ghost" is a beautiful, harmless spirit named Yuuna, and the inn is filled with other supernatural tenants, including a cat girl, a demon, and a zashiki-warashi.

Why it's like DxD: It's a supernatural, slice-of-life comedy with high-level fan service and a clear harem dynamic. While the action is less frequent than in DxD, the supernatural world-building and the focus on the protagonist's interactions with a house full of beautiful monster girls make it a perfect, relaxing companion piece.

10. Tsugumomo

Kazuya Kagami is haunted by a powerful spirit named Kiriha, who is the spirit of his mother's obi (a kimono sash). He is forced into the world of exorcists, spirits, and gods, where he must fight alongside Kiriha and other powerful female spirits to protect the town.

Why it's like DxD: This series is a strong blend of action, comedy, and ecchi, featuring a protagonist who is constantly fighting supernatural threats while dealing with the demands of his powerful, often possessive, female partners. The focus on Japanese mythology and the spirit world gives it a unique flavor while retaining the high-stakes battle sequences.