Basara Toujo 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!?
All Reviews:
Mixed (20) - 60% of the 20 user reviews for this series are positive.
Release Date:
Mar 30, 2017
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Notice: The Testament of Sister New Devil is no longer available on the Steam store.
 

Series Content

Season 1
Season 2
1. The Day I Got a Little Sister
Jan 7, 2015
24 minutes
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...
2. First Contract Between Servant and Master
Jan 14, 2015
24 minutes
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.
3. Reunion and a Gap in Trust
Jan 21, 2015
24 minutes
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.
4. Until Sadness Reaches Zero
Jan 28, 2015
24 minutes
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...
5. A Little Sister's Morning Demon Lording
Feb 4, 2015
24 minutes
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.
6. Bearing Growing Emotions
Feb 11, 2015
24 minutes
Basara goes on a date with Yuki. Unaccostomed to the shopping center, When the two of them are overwhelmed by a clerk's sales talk, Mio stops following to rescue them.
7. The Depths of Love and Hatred
Feb 18, 2015
24 minutes
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.
8. Erotic Succubus Out of Control
Feb 25, 2015
24 minutes
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!
9. Merits and Demerits of Master and Servant
Mar 4, 2015
24 minutes
Basara and Yuki begin the ceremony to form their pact. Clad in a bustier and garter belt, Yuki was raring to go for it, but she refused to forge the pact normally, and suffered the same succubus curse as Mio.
10. Plaintive Betrayal
Mar 11, 2015
24 minutes
Mio has been captured by Zolgia following Maria's betrayal. Basara too is captured by Lars and brought to Zolgia's mansion. Lars' goal is to exchange Basara for Mio. He explains that he's only doing his duty as Mio's observer, but negotiations fail, and Zest slays him.
11. Espionage... What Lies After
Mar 18, 2015
24 minutes
Strength as a human, the power to rend evil--With the power inherited from his father, Toujou Jin, Basara faces off against Zolgia. Basara is driven by the desire to protect his precious family. That desire gives him strength, and even as Zolgia pushes him to the edge, he rises without breaking...
12. For This Night, This Moment
Mar 25, 2015
24 minutes
Everyone is trapped inside the body of the demon realm's most dangerous creature, a beast capable of infinitely multiplying until it swallows the entire world. Dimensionally cut off, the only remaining option for Basara and the others is to completely eliminate this dangerous creature's vital core.
1. What I Can Do For You
Oct 9, 2015
24 minutes
After ending the battle against Zolgia, Basara regains his peaceful life with his two little sisters, Mio, the daughter of the previous demon lord, and Maria, her little sister who's also a succubus. As Basara pursues the preparations for the sports festival at school, one day he's attacked...
2. Suspicions Deepening Within Mysteries
Oct 16, 2015
24 minutes
The day of the sports festival is finally here. Though Basara remains cautious of the mysterious enemy who manipulates people with magic, he happily enjoys the sports festival with Mio and Yuki as the three of them compete in the four-legged-race and enjoy their youth getting entangled and...
3. My Cherished Feelings, For You
Oct 23, 2015
24 minutes
After taking Kurumi hostage, Ornis robs Basara of the right arm wielding Bynhildr. Though he lost conciousness from the pain, his sealed power unleashes and goes on a rampage. Their positions are reversed as he corners Ornis with his overwhelming power. However, the moment he tries to silence...
4. Amidst Entwining Plots
Oct 30, 2015
24 minutes
As the clash between the peaceful faction and the present demon lord faction draws near, Basara visits the peaceful faction along with Mio. Though Basara enjoys their reunion with Zest and Shella, Maria seems to be acting odd. In fact, a heavy punishment was awaiting her for her betrayal...
5. Amidst the Wind Blowing Through the Battlefield
Nov 6, 2015
24 minutes
Ramsus is out to extract the "Demon Lord's Power" that Mio possesses, and Basara reveals his anger at Ramsus' lack of concern for Mio's safety. Just as sparks are about to fly, Shella interrupts them. She leads Basara into the bath to try and help calm him down, and when Zest appears...
6. Between Reality and One's Own Truth
Nov 13, 2015
24 minutes
Basara and the others recieve a message from Lars, calling them to Leohart's royal castle. Then Basara's father, Toujou Jin, appears before them all. He brought with him another message from Leohart. A message saying that they would hold a tournament before Leohart and Ramsus' forces...
7. Between Entwining Plots and Desires
Nov 20, 2015
24 minutes
Basara and the others finally face the current demon lord, Leohart. Leohart's confidence in his strength fills the air as he welcomes them in without any tricks. Can they really beat him? After Maria encourages them to do what they can for now, Basara commands Mio, Yuki, Maria, Kurumi, and Zest...
8. Those Contending For The Future
Nov 27, 2015
24 minutes
The group battle between Leohart and Ramsus's forces finally begins. After Mio wins the first match, Maria enters the arena for the next round. Her opponent is Lars. Maria uses her enormous power to face him in close combat, but she fails to overcome the gap in experience and magic power, ...
9. Beyond the Endless Dream
Dec 4, 2015
24 minutes
The only remaining match of the tournament is the duel between leaders, Basara vs Leohart. Basara finally appears after his long time in hiding, and faces off against Leohart. The two demon swords clash in fierce battle. Though Basara manages to keep up with Leohart, Leohart clearly holds ...
10. The Consequences of What Must Be Done
Dec 11, 2015
24 minutes
The council's rampage sends quakes through the demon realm, and the demon Chaos is called forth through a giant magic circle. That commander of all heroic spirits flails madly, seeking to claim Basara, Mio, and Leohart's lives. Do they even stand a chance of victory with this supreme being...
init_data: 0.0834, render: 0.0425

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About This Series

Basara Toujo 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!

System Requirements

Windows
macOS
SteamOS + Linux
    Minimum:
    • OS *: Windows 7
    • Processor: Intel Core 2 or AMD equivalent
    • Memory: 1 GB RAM
    • Network: Broadband Internet connection
    • Storage: 200 MB available space
    • Additional Notes: Network Bandwidth of 5Mbps for 540p, 3Mbps for 360p.
    Recommended:
    • OS: Windows 10
    • Processor: Intel Core I3+ or AMD equivalent recommended for HD 1080p playback
    • Memory: 2 GB RAM
    • Network: Broadband Internet connection
    • Storage: 500 MB available space
    • Additional Notes: Network Bandwidth of 12Mbps for 1080p or 8Mbps for 720p.
* Starting January 1st, 2024, the Steam Client will only support Windows 10 and later versions.
    Minimum:
    • OS: Mac OSX 10.7
    • Processor: Intel Core 2 or AMD equivalent
    • Memory: 1 GB RAM
    • Network: Broadband Internet connection
    • Storage: 200 MB available space
    • Additional Notes: Network Bandwidth of 5Mbps for 540p, 3Mbps for 360p.
    Recommended:
    • OS: Mac OSX 10.10+
    • Processor: Intel Core I3+ or AMD equivalent recommended for HD 1080p playback
    • Memory: 2 GB RAM
    • Network: Broadband Internet connection
    • Storage: 500 MB available space
    • Additional Notes: Network Bandwidth of 12Mbps for 1080p or 8Mbps for 720p.
* Starting February 15, 2024, the Steam Client will no longer support 32-bit games or macOS 10.14 or lower.
    Minimum:
    • OS: Linux Ubuntu 12.04 or later, SteamOS 2.20 or later
    • Processor: Intel Core 2 or AMD equivalent
    • Memory: 1 GB RAM
    • Network: Broadband Internet connection
    • Storage: 200 MB available space
    • Additional Notes: Network Bandwidth of 5Mbps for 540p, 3Mbps for 360p.
    Recommended:
    • OS: Linux Ubuntu 12.04 or later, SteamOS 2.20 or later
    • Processor: Intel Core I3+ or AMD equivalent recommended for HD 1080p playback
    • Memory: 2 GB RAM
    • Network: Broadband Internet connection
    • Storage: 500 MB available space
    • Additional Notes: Network Bandwidth of 12Mbps for 1080p or 8Mbps for 720p.

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