Trinity Seven OVA

トリニティセブン七つの大罪と七魔道士 (Trinity Seven: Nanatsu no Taizai to Nana Madoushi)

7.3(78,556)

MAL Score

Ranked #3064

Popularity #1805

Action
Comedy
Ecchi
Fantasy
Romance
Harem
School

Episodes: 1
Duration: 26 min
Aired: Mar 25, 2015
Status: Finished Airing

Synopsis

Arata is on the verge of being expelled, and the only way out is to deepen his understanding of the magic archives. To do that, he turns to the Trinity Seven for direct instruction.

With the school’s rules closing in, Arata’s lessons quickly pull him into a lively mix of action, comedy, and romantic tension as the Trinity Seven put him through his paces.

Otaku Consensus

Trinity Seven OVA lands as fan-service-first bonus material that knows exactly why its audience came back: ZAQ’s high-energy opening, brisk one-episode pacing, Arata’s unusually forward harem-protagonist attitude, and the cast’s easy comic chemistry. Critics and fans tend to call the franchise more fun and competent than its ecchi-harem label suggests, with the most consistent criticism being that the sexual comedy is so central that it can crowd out the fantasy material and age unevenly on rewatch.

Why You Should Watch

Watch Trinity Seven OVA if you want a compact hit of ecchi magical-school chaos without a long re-entry ramp. It is built for viewers who enjoy High School DxD-style supernatural harem banter, but prefer a protagonist who leans into flirtation instead of spending every scene panicking. The appeal is less “major new chapter” and more “extra session with the ensemble”: Lilith’s straight-man irritation, Levi’s teasing rhythm, Arin’s deadpan energy, and Arata’s shameless confidence are the engine. If your favorite part of Trinity Seven was its mixture of spell jargon, rapid-fire innuendo, and unapologetic fan service, this OVA delivers that in one focused episode. If you need plot escalation over character-driven teasing, it will feel light.

Key Characters

A
Arata Kasuga(VA: Yoshitsugu Matsuoka)
Arata stands out among harem leads because fans frequently point to his confident, openly flirtatious reactions as a refreshing break from the genre’s usual embarrassment routine.
L
Lilith Asami(VA: Yumi Hara)
Lilith functions as the sharpest source of comic friction, balancing the OVA’s lewd escalation with exasperated discipline and school-authority energy.
L
Levi Kazama(VA: Ayane Sakura)
Levi’s appeal comes from her mischievous, fast-moving banter, making her one of the characters most naturally suited to the OVA’s compressed comedy rhythm.
A
Arin Kannazuki(VA: Aya Uchida)
Arin brings the deadpan kuudere flavor reflected in the series’ fan tagging, giving even the most chaotic scenes a blunt, off-kilter comic edge.

What Makes It Stand Out

1
The OVA is a single-episode release from Seven Arcs Pictures, aired on March 25, 2015, so it plays less like a new season opener and more like a concentrated character-and-fan-service add-on for existing viewers.
2
ZAQ performs the opening theme, and user reactions specifically single it out as a nostalgia trigger whose upbeat sound matches Trinity Seven’s chaotic, unserious energy.
3
AniList’s tag distribution captures the OVA’s priorities with unusual clarity: Female Harem at 95%, Magic at 80%, Nudity at 65%, and School at 60%, making it one of those entries where the database tags are practically a content warning and a sales pitch at once.
4
Its reception sits in the “liked by its niche” zone rather than broad critical acclaim: MAL lists it at 7.32 from 78,528 votes, while AniList records a 70/100 score and 311 favourites.
5
The OVA benefits from a protagonist-centered harem dynamic that fans repeatedly highlight as a change of pace, because Arata’s lack of timidness turns the ecchi comedy into mutual provocation rather than one-sided accidental embarrassment.

Fun Facts & Trivia

Fun fact 1: The Japanese title, Trinity Seven: Nanatsu no Taizai to Nana Madoushi, directly foregrounds the franchise’s “seven” motif rather than branding the episode simply as an untitled bonus OVA.
Fun fact 2: Original creator Kenji Saitou and original character designer Nao Akinari are credited in the production data, tying the OVA’s character appeal back to the same source-material identity that drives the main series.
Fun fact 3: Despite being only one episode, the OVA has a sizable MAL footprint: 78,528 recorded votes, a popularity rank of #1804, and an overall rank of #3057.
Fun fact 4: Fan comments about the OVA repeatedly return to the opening before anything else, with multiple rewatch impressions describing it as instantly nostalgic and tightly aligned with the franchise’s hornier, high-energy personality.
Fun fact 5: The main cast listing includes several recognizable Japanese voice actors in central roles, including Yoshitsugu Matsuoka as Arata, Yumi Hara as Lilith, Ayane Sakura as Levi, Aya Uchida as Arin, and Ryouka Yuzuki as Akio.