Chaos Zero Nightmare ASSet Ripper

ASSet Ripper is a tool for extracting encrypted pack assets from yuna engine, or certain anime games.

→ Download ←

Important

Releases tab has outdated builds and won't be updated anymore. Download the tool using the link above or via Github Actions

Features

Preview supported formats such as:

• SCT images (exported as PNG files)
• Encrypted databases (exported as JSON files)
• SCSP spine format (exported as JSON), compatible with tools such as SpineViewer. The tool also includes an integrated Spine Viewer

And export either all files or only selected files and folders, depending on your preference.

How to use

DataPack archives

1. Click Open Pack and select data.pack located under: WhereYouInstalledTheGame\ChaosZeroNightmare\bin\appdata\cznlive or, for the Chinese version, WhereYouInstalledTheGame\bin\appdata\prod\data.pack.
2. Click Scan Tree to scan the pack and build the game resource tree.

SSRA archives

1. Click Open Pack and select a manifest.ssra directly, usually inside the game's gameres directory.
2. Keep the corresponding .ssrc files in the sibling chunks directory, for example gameres\chunks.
3. Click Scan Tree to scan the manifest and its available chunks.

Navigating the File Tree and Exporting

You can navigate the file tree using either mouse or keyboard input.

Mouse Controls

• Scroll to move through the file tree
• Click to select items

Keyboard Controls

• Up / Down Arrow — move selection
• Left / Right Arrow — collapse or expand folders

Multi-Selection

Multiple files and folders can be selected for batch export:

• Ctrl + Right Click
• Ctrl + Up / Down Arrow

CLI

ChaosZeroNightmareRipper-CLI.exe ships alongside the GUI and extracts named folders without opening a window, which makes it usable from scripts. It is a standalone binary and needs none of the DLLs the GUI uses.

ChaosZeroNightmareRipper-CLI --pack "WhereYouInstalledTheGame\ChaosZeroNightmare\bin\appdata\cznlive\data.pack" --out D:\czn_assets --folder rarity --folder tp_skill --folder select_scene --folder collapse/collapse_illustration

Flag	Meaning
-p, --pack <path>	data.pack, a manifest.ssra, or an unpacked directory
-o, --out <dir>	destination directory, created if missing
-f, --folder <path>	archive-relative folder or file to extract; repeat for more than one
--no-png	keep .sct / .sct2 as-is instead of converting to .png
--no-json	keep .db as-is instead of converting to .json
-v, --verbose	print each extracted file
-q, --quiet	suppress the progress bar
-h, --help	show help

The output preserves the full archive path, so --out D:\out --folder collapse/collapse_illustration writes to D:\out\collapse\collapse_illustration\. Texture and database conversion are on by default, matching the GUI. A folder that is not in the archive is reported but does not stop the others, and the exit code says what happened: 0 every folder found and extracted, 1 usage error, 2 the pack could not be opened or scanned, 3 some folders were missing or failed, 4 none could be extracted. Errors on individual files are logged and skipped without changing the exit code, so check czn_ripper.log to confirm a clean run.

Build Instructions

git clone https://github.com/akioukun/Chaos-Zero-Nightmare-ASSet-Ripper.git
cd Chaos-Zero-Nightmare-ASSet-Ripper
mkdir build && cd build
cmake ..
cmake --build . --config Release