Trinity Seven is a fun, action-packed harem fantasy anime that blends magic, comedy, and romance in a world where magic is real and those who wield it attend specialized academies. The story follows Arata Kasuga, a boy whose cousin Hijiri disappears in a mysterious magical incident known as a “Breakdown Phenomenon.” Determined to find her, he enrolls in the Royal Biblia Academy, where he meets the Trinity Seven—seven powerful female mages, each representing one of the seven deadly sins. Together, they navigate the complexities of magic, the secrets of the academy, and the growing feelings between Arata and the girls.
The series is defined by its core themes: a power system rooted in magical theory and the manipulation of “magic circles,” where each mage’s abilities are tied to their unique “theme” or sin. Arata is a quintessential underdog in a unique sense—he is a newcomer to the world of magic, but he possesses an unusual ability that makes him a valuable ally. Trinity Seven masterfully subverts expectations by presenting what appears to be a simple harem action series and gradually revealing a more complex narrative about identity, desire, and the nature of magic itself. It is a series that understands the power of confidence.
For fans of Trinity Seven, finding similar anime can be a challenge. The series occupies a unique space—part harem comedy, part magical action, part school drama. Yet, many underrated series share its core DNA: a focus on a male protagonist at a magic academy surrounded by powerful female characters, an exploration of romantic relationships with multiple partners, and a willingness to blend action, comedy, and romance with a self-aware sense of humor. These shows deserve far more attention for their entertainment value, their character development, and their refusal to provide easy answers.
Here are 15 underrated anime that capture the spirit of Trinity Seven.
1. The Irregular at Magic High School (2014)
- Streaming Availability: Crunchyroll, Funimation, Hulu
- Rating: MAL: 7.4
- Episodes: 26
- Studio: Madhouse
- Notable Staff: Based on the light novel series by Tsutomu Satou.
Plot Summary: Tatsuya and Miyuki Shiba enroll at First High School. Tatsuya is placed in the “Weed” class for students with low practical magic scores, but he possesses immense technical knowledge and unique abilities.
Similarities to Trinity Seven: Both are set in a magic academy and follow a male protagonist who is initially underestimated but possesses unique abilities. The focus is on the strategic application of magic and the bonds with classmates. The series is a blend of action, drama, and political intrigue.
2. Chivalry of a Failed Knight (2015)
- Streaming Availability: Crunchyroll, Hulu
- Rating: MAL: 7.4
- Episodes: 12
- Studio: Silver Link, Nexus
- Notable Staff: Based on the light novel series by Riku Misora.
Plot Summary: Ikki Kurogane, a student branded a “Failed Knight” due to his low magical power, refuses to give up on his dream. He relies on his honed swordsmanship and strategic brilliance.
Similarities to Trinity Seven: Both are about a male protagonist who is underestimated by a flawed system despite possessing immense skill. The focus is on the strategic application of abilities and the bonds formed with a talented female partner. The series is a heartfelt, action-packed underdog story.
3. A Certain Scientific Railgun (2009)
- Streaming Availability: Crunchyroll, Funimation
- Rating: MAL: 7.7
- Episodes: 24 (Season 1)
- Studio: J.C. Staff
- Notable Staff: Based on the manga by Kazuma Kamachi.
Plot Summary: Mikoto Misaka, one of the most powerful espers in Academy City, investigates the dark secrets of the city while navigating her friendships and rivalries.
Similarities to Trinity Seven: Both are set in a world where supernatural powers are real and follow a protagonist who investigates the mysteries of their world. The focus is on the bonds between characters and the challenges they face. The series is a fun, action-packed adventure.
4. Blue Exorcist (2011)
- Streaming Availability: Crunchyroll, Funimation, Hulu
- Rating: MAL: 7.5
- Episodes: 25 (Season 1)
- Studio: A-1 Pictures
- Notable Staff: Based on the manga by Kazue Kato.
Plot Summary: Rin Okumura discovers he is the son of Satan, but vows to become an Exorcist and defeat his father. He enrolls at True Cross Academy.
Similarities to Trinity Seven: Both are about a young protagonist with immense power who must learn to control it and protect others. The focus is on the bonds with companions and the challenges of training. The series is a blend of action, comedy, and drama.
5. The Asterisk War (2015)
- Streaming Availability: Crunchyroll
- Rating: MAL: 6.9
- Episodes: 12 (Season 1)
- Studio: A-1 Pictures
- Notable Staff: Based on the light novel series by Yuu Miyazaki.
Plot Summary: Ayato Amagiri transfers to Seidoukan Academy, a school where students with special abilities compete in tournaments. He must find a partner and navigate the political landscape.
Similarities to Trinity Seven: Both are set in elite academies where students with unique powers compete in structured tournaments. The focus is on the partnership between the male protagonist and a talented female fighter. The series is a blend of action, comedy, and romance.
6. Absolute Duo (2015)
- Streaming Availability: Crunchyroll, Funimation
- Rating: MAL: 6.4
- Episodes: 12
- Studio: 8-Bit
- Notable Staff: Based on the light novel series by Takumi Hiiragiboshi.
Plot Summary: Tooru Kokonoe, an unusual student who manifests a shield instead of a weapon, enrolls at Kouryou Academy. He must partner with Julie Sigtuna, a mysterious girl.
Similarities to Trinity Seven: Both are set in a school where students manifest weapons and must form partnerships. The focus is on the bond between the male protagonist and a central female character, with a blend of action and romance.
7. Hundred (2016)
- Streaming Availability: Crunchyroll
- Rating: MAL: 6.1
- Episodes: 12
- Studio: Production IMS
- Notable Staff: Based on the light novel series by Jun Misaki.
Plot Summary: Hayato Kisaragi, a boy with the highest compatibility with the “Hundred” weapons, enrolls at Little Garden academy. He must navigate training and form partnerships.
Similarities to Trinity Seven: Both are harem action series set in a school for students with special weapons, where the male protagonist is unique or exceptional. The focus is on the relationships with multiple female characters and the blend of action, comedy, and romance.
8. Infinite Stratos (2011)
- Streaming Availability: Crunchyroll
- Rating: MAL: 6.7
- Episodes: 12 (Season 1)
- Studio: 8-Bit
- Notable Staff: Based on the light novel series by Izuru Yumizuru.
Plot Summary: Ichika Orimura is the only male in the world who can pilot an “Infinite Stratos,” a powerful exoskeleton. He enrolls in a school filled with female pilots.
Similarities to Trinity Seven: Both are about a male protagonist who is unique in a world dominated by women, and is surrounded by female characters. The focus is on the harem relationships and the blend of action and comedy. The series is a fun, lighthearted fantasy.
9. Bladedance of Elementalers (2014)
- Streaming Availability: Crunchyroll, Funimation
- Rating: MAL: 6.6
- Episodes: 12
- Studio: TNK
- Notable Staff: Based on the light novel series by Yuu Shimizu.
Plot Summary: Kamito Kazehaya, the only male elementalist in the world, is forced to attend Areishia Spirit Academy, a school for female elementalists.
Similarities to Trinity Seven: Both are about a male protagonist who is unique in a female-dominated world and must navigate a school setting. The focus is on the harem relationships and the tournament arc. The series is a fun, action-packed fantasy.
10. The Legend of the Legendary Heroes (2010)
- Streaming Availability: Crunchyroll, Funimation
- Rating: MAL: 7.5
- Episodes: 24
- Studio: Zexcs
- Notable Staff: Based on the light novel series by Takaya Kagami.
Plot Summary: Ryner Lute, a lazy but brilliant mage with cursed eyes, and Ferris Eris, a skilled swordswoman, embark on a quest to find legendary relics.
Similarities to Trinity Seven: Both feature a brilliant but reluctant protagonist with a supernatural power who must navigate political intrigue. The focus is on the cost of power and the bonds formed with companions. The series is an ambitious, character-driven fantasy.
11. Maburaho (2003)
- Streaming Availability: Not currently available on major platforms.
- Rating: MAL: 6.6
- Episodes: 24
- Studio: J.C. Staff
- Notable Staff: Based on the light novel series by Toshihiko Tsukiji.
Plot Summary: Kazuki Shikimori, a student at a magic academy, discovers he has a rare genetic trait that makes him desirable to powerful mages.
Similarities to Trinity Seven: Both are about a male protagonist at a magic academy who is initially seen as lacking talent but possesses unique abilities. The focus is on the development of the protagonist and his relationships. The series is a blend of action, comedy, and harem elements.
12. Tokyo Ravens (2013)
- Streaming Availability: Crunchyroll
- Rating: MAL: 7.3
- Episodes: 24
- Studio: 8-Bit
- Notable Staff: Based on the light novel series by Kouhei Azano.
Plot Summary: Harutora Tsuchimikado, from a prestigious onmyouji family, lacks the ability to see spirits. His life changes when his childhood friend Natsume re-enters his life.
Similarities to Trinity Seven: Both are about a protagonist from a magical family who is initially seen as lacking talent but proves his worth. The focus is on the bonds between characters and the supernatural threats they face. The series is a blend of action, drama, and political intrigue.
13. Undefeated Bahamut Chronicle (2016)
- Streaming Availability: Crunchyroll, Funimation
- Rating: MAL: 6.5
- Episodes: 12
- Studio: Lerche
- Notable Staff: Based on the light novel series by Senri Akatsuki.
Plot Summary: Lux Arcadia, a former prince known as the “Weakest Undefeated,” is forced to become a servant for the girls at an academy while piloting powerful mechs.
Similarities to Trinity Seven: Both are harem action series set in an academy where the male protagonist pilots powerful weapons and is surrounded by female characters. The focus is on the relationships and the blend of action, comedy, and romance.
14. Aesthetica of a Rogue Hero (2012)
- Streaming Availability: Crunchyroll, Funimation
- Rating: MAL: 6.7
- Episodes: 12
- Studio: Arms
- Notable Staff: Based on the light novel series by Tetsuto Uesu.
Plot Summary: Akatsuki Ousawa, a hero who defeated a demon king, returns to Earth with the demon king’s daughter. He enrolls in a school for those who have returned from other worlds.
Similarities to Trinity Seven: Both are about a male protagonist who is incredibly skilled but underestimated, and is surrounded by female characters. The focus is on the harem relationships and the blend of action and comedy.
15. High School DxD (2012)
- Streaming Availability: Crunchyroll, Funimation
- Rating: MAL: 7.3
- Episodes: 12 (Season 1)
- Studio: TNK
- Notable Staff: Based on the light novel series by Ichiei Ishibumi.
Plot Summary: Issei Hyoudou, a perverted high school student, is killed and resurrected as a devil by Rias Gremory. He becomes her servant and fights in supernatural battles.
Similarities to Trinity Seven: Both are harem anime about a male protagonist who discovers hidden powers and is surrounded by powerful female characters. The focus is on the relationships and the blend of comedy, action, and romance. The series is a fun, ecchi fantasy.
Why These Anime Work for Trinity Seven Fans
Fans of Trinity Seven are drawn to stories that blend magic, action, and harem comedy, and they are invested in protagonists who are confident, capable, and surrounded by powerful female characters. They appreciate a narrative that doesn’t take itself too seriously, but that still delivers genuine emotional moments and character development. They are not looking for complex philosophical narratives, but for fun, entertaining stories that make them smile.
The anime listed above all share this fundamental DNA:
- The Magic Academy Setting: Whether it is Royal Biblia Academy, First High School, or True Cross Academy, these series understand that the magic school is the perfect setting for exploring themes of self-discovery, competition, and romance. The focus is on the bonds formed between classmates.
- The Powerful Protagonist: The protagonists are often skilled, confident, or possess unique abilities that set them apart. They are not weak underdogs, but individuals who are capable and determined. Their journey is one of growth and self-discovery.
- Subversion of the Harem Genre: These series use the framework of the harem genre to explore deeper themes of identity, desire, and the nature of power. They understand that the most compelling stories are not just about choosing a partner, but about the bonds that form along the way.
These 15 anime, like Trinity Seven, are not afraid to be fun. They are underrated gems that offer an entertaining, action-packed, and emotionally resonant experience for viewers who are looking for stories about the power of magic, the bonds of friendship, and the thrill of adventure.
