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The Testament of Sister New Devil
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!?

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Languages:
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English ✔
Japanese ✔
Notice: The Testament of Sister New Devil is no longer available on the Steam store.
 

Season 1

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.
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Steam Video

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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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