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The Testament of Sister New Devil

Name: The Testament of Sister New Devil
Director: Hisashi Saito
Genre: Animation, Action & Adventure, Comedy, Sci-Fi & Fantasy
Released: 2015-01-07
Rating: 7.9

新妹魔王の契約者

AnimationAction & AdventureComedySci-Fi & Fantasy

Watch Free

We checked 8 streaming services in India on 30 May 2026 at 04:44 IST

2015

2 Seasons

22 Episodes

Ended

TV-MA

About

Toujou Basara is a high school student whose father has suddenly just remarried. His father then departs overseas leaving Basara with two new beautiful step-sisters. Little does he know, his new sisters, Mio and Maria are actually the new Demon Lord and a succubus!? Almost trapped into a life of servitude, Basara forms a reverse contract by accident and ends up becoming Mio's master! Hijinks ensue as Basara finds himself in one ecchi situation after another. However, Mio's life is in danger as she is pursued by demons and heroes!

#magic#supernatural#high school#harem#romance#demon#ecchi#anime#based on light novel

Cast

Yuichi Nakamura

as Basara Tojo (voice)

Ayaka Asai

as Mio Naruse (voice)

Kaori Fukuhara

as Maria Naruse (voice)

Tomokazu Sugita

as Yahiro Takigawa (voice)

Yuu Asakawa

as Chisato Hasegawa (voice)

Iori Nomizu

as Kurumi Nonaka (voice)

Sarah Emi Bridcutt

as Yuki Nonaka (voice)

Keiji Fujiwara

as Jin Tojo (voice)

Seiko Yoshida

as Zest (voice)

Seasons

Season 1

12 episodes2015

Burst

10 episodes2015

After two demon girls, Maria the succubus and Mio the demoness, force Basara into a contract that makes him their master, the trio form a complicated master-servant relationship. Basara is the last descendant of a demon-fighting hero clan, but as master of two demon girls, he finds himself defending them instead of fighting them.

Episodes

Season 1

See all 12episodes →

The Day I Got A Little Sister

Jan 7, 201525m7.6

Thanks to his father's sudden remarriage, Toujou Basara finds himself with two beautiful new step-sisters. Their names are Naruse Mio and Maria. Mio wakes him up in the morning, while Maria stands in the kitchen wearing a suggestive outfit...

First Contract Between Servant And Master

Jan 14, 201526m7.6

As daughter of the former demon lord, Mio's foster parents were slain by powerful demons after her life. Still seeking to slay her, Basara reveals himself as a member of the hero clan--an enemy of the demons--and vows to protect Mio as a member of his family.

Reunion and a Gap in Trust

Jan 21, 201525m5.9

Basara's childhood friend Nonaka Yuuki warns him not to get involved with Naruse Mio any longer. She is a fellow member of the hero clan, and the one charged with observing Mio. She claims that Mio will bring great disaster, but Basara proclaims that he will protect Mio as a girl on his own.

Until Sadness Reaches Zero

Jan 28, 201525m5.3

Basara suffers a deep wound in the battle against the white-masked man after Mio's power. Mio regrets getting Basara involved, and challenges the white-masked man to battle on her own. Meanwhile, in order to protect Mio, Basara resolves to use the "forbbiden art" he sealed away after the events of his past. What was the tragedy that visited the hero village and Basara?

A Little Sister's Morning Demon Lording

Feb 4, 201525m4.8

With the battle against the white-masked man settled, they returned to their bawdy daily life. Basara wakes up with his hand groping Maria's butt, he runs into a naked Mio when he enters the bathroom, and Yuki sneaks into the bath with him. The master-servant pact lying at the heart of everything. Accoring to Takigawa, his classmate and the white-masked man, the pact between Basara and Mio holds another secret. Meanwhile, Basara's childhood friend Yuki invites him out on a date...

Bearing Growing Emotions

Feb 11, 201525m5.0

Basara goes on a date with Yuki. Unaccustomed to the shopping center, when the two of them are overwhelmed by a clerk's sales talk, Mio stops following to rescue them.

The Depths of Love and Hatred

Feb 18, 201523m4.8

Basara leads Mio to higher peaks as he pursues pleasure with the use of syrup. With their master-servant pact reaching a new level, they both bring their full might to face the ones trying to eliminate Mio: Takashi and Kurumi.

Erotic Succubus Out of Control

Feb 25, 201524m7.7

Ten days pass since the battle with Takashi and others. Although the battle ended with reconciliation, Yuki returned to the hero's village. ...or she was supposed to, but when Basara returns home, he finds Yuki in an apron!

Where does The Testament of Sister New Devil rank today?

The Testament of Sister New Devil is #523 on the CineFlixo Daily Streaming Charts today.

Highest: #523
Top 10: 0 days
Top 100: 0 days

Watch The Testament of Sister New Devil Online Free — All Episodes in HD

Stream The Testament of Sister New Devil online free in HD on CineFlixo. A well-rated animation, action & adventure, comedy, and sci-fi & fantasy series originally produced in Japonés and released in 2015, it's earned a solid 7.9/10 from 356 viewers worldwide.

About The Testament of Sister New Devil

The Testament of Sister New Devil Cast and Characters

The cast features Yuichi Nakamura (as Basara Tojo (voice)), Ayaka Asai (as Mio Naruse (voice)), Kaori Fukuhara (as Maria Naruse (voice)), Tomokazu Sugita (as Yahiro Takigawa (voice)), and Yuu Asakawa (as Chisato Hasegawa (voice)). Their performances are a major reason The Testament of Sister New Devil has built such a passionate audience.

Where to Watch The Testament of Sister New Devil Online

On CineFlixo you can watch The Testament of Sister New Devil free — no account, no credit card, no ads in the middle of the show. We stream the full series in 720p / 1080p HD, with subtitles when available, on any device: phone, tablet, laptop, or smart TV browser.

▶ Watch The Testament of Sister New Devil Now

Why People Are Watching The Testament of Sister New Devil

There's a reason The Testament of Sister New Devil keeps showing up on "must-watch" lists. What makes it work is sharp comedic timing that lands consistently, action sequences that don't feel cheap, and world-building that respects the audience's intelligence. If you enjoy Japonés storytelling that doesn't follow the same tired beats, this is the kind of show you'll end up recommending to friends.

Frequently Asked Questions about The Testament of Sister New Devil

Where can I watch The Testament of Sister New Devil online for free?

You can watch The Testament of Sister New Devil online free on CineFlixo. Just open the page and hit play — no signup, no subscription, full HD streaming on phone, tablet, or desktop.

How many episodes does The Testament of Sister New Devil have?

The Testament of Sister New Devil has 22 episodes across 2 seasons. All episodes are available to stream right here on CineFlixo.

Is The Testament of Sister New Devil good? What's the rating?

The Testament of Sister New Devil holds a 7.9/10 rating based on 356 reviews — well above average.

Who is in the cast of The Testament of Sister New Devil?

The main cast includes Yuichi Nakamura, Ayaka Asai, Kaori Fukuhara, and Tomokazu Sugita, plus a strong supporting ensemble.

Is The Testament of Sister New Devil available in Japonés?

Yes — The Testament of Sister New Devil was originally produced in Japonés and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.

When was The Testament of Sister New Devil released?

The Testament of Sister New Devil first aired in 2015.

Do I need an account to watch The Testament of Sister New Devil on CineFlixo?

No. CineFlixo is free and you can watch The Testament of Sister New Devil without creating an account. Sign-up is optional — only useful if you want a personal Watchlist or to comment on episodes.

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If you enjoyed The Testament of Sister New Devil, check out New Century Legend Mars, The Resilient Dr. Ling, YJ Ban Lemon Angel, My Mischievous Fiancée, and Secret Jouju.

Frequently Asked Questions

Where can I watch The Testament of Sister New Devil for free?

You can watch The Testament of Sister New Devil online for free on CineFlixo. All 22 episodes across 2 seasons are available to stream in HD without a subscription, signup, or paywall. Just open the show page and press play.

How many seasons and episodes does The Testament of Sister New Devil have?

The Testament of Sister New Devil currently has 2 seasons and a total of 22 episodes. The series status is "Ended", so the episode count may grow as new seasons are released. You can browse the full episode list on CineFlixo and continue watching from where you left off.

What is The Testament of Sister New Devil about?

In which language is The Testament of Sister New Devil originally available?

The Testament of Sister New Devil was originally produced in JA. On CineFlixo the show is available in its original JA audio. Check the player options on the watch page for available subtitle tracks.

When was The Testament of Sister New Devil first released?

The Testament of Sister New Devil first premiered on January 7, 2015 (2015). The series has since concluded its run.