東方永夜抄　～ Imperishable Night

<picture> <img alt="Decomp Progress" src="resources/progress.svg"> </picture>

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Important notice

As of 5 September 2026, future decompilation of th08 will be done in private, and will be made public until the decompilation is completed, due to the actions of certain bad actors in this space, notably vibecoders and other grifters.

We work hard in our free time to provide code that reconstructs Touhou 8's original source to the best of our knowledge. We believe that we offer the highest quality code that accurately matches the original binary.

The rise of grifters (AI decompilations and ports) in this space taking from our work paints a bad image for future decompilation efforts and has also taken a toll on us psychologically.

Therefore, we have decided to continue decompilation work in private until it has concluded. We apologize for the inconvenience but we believe that this drastic action is necessary given the current circumstances.

Don't worry, when the decompilation is concluded, all the code, as well as the commit history, pull requests, will be available. For the time being, this repo serves as a snapshot before decompilation was made private, and progress updates will be given.

Stay tuned for the full code release of th08.

Introduction

This project aims to perfectly reconstruct the source code of Touhou Eiyashou ~ Imperishable Night 1.00d by Team Shanghai Alice.

This project is still highly work in progress and in its early stages.

Installation

Executable

This project requires the original th08.exe version 1.00d (SHA256 hashsum 330fbdbf58a710829d65277b4f312cfbb38d5448b3df523e79350b879213d924, you can check hashsum on windows with command certutil -hashfile <path-to-your-file> SHA256.)

Copy th08.exe to resources/.

Dependencies

The build system has the following package requirements:

• python3 >= 3.4
• msiextract (On linux/macos only)
• wine (on linux/macos only, prefer CrossOver on macOS to avoid possible CL.EXE heap issues)
• aria2c (optional, allows for torrent downloads, will automatically install on Windows if selected.)

The rest of the build system is constructed out of Visual Studio 2002 and DirectX 8.0 from the Web Archive.

Configure devenv

This will download and install compiler, libraries, and other tools.

If you are on windows, and for some reason want to download dependencies manually, run this command to get the list of files to download:

python scripts/create_devenv.py scripts/dls scripts/prefix --no-download

But if you want everything to be downloaded automatically, run it like this instead:

python scripts/create_devenv.py scripts/dls scripts/prefix

And if you want to use torrent to download those dependencies, use this:

python scripts/create_devenv.py scripts/dls scripts/prefix --torrent

On linux and mac, run the following script:

# NOTE: On macOS if you use CrossOver.
# export WINE=<CrossOverPath>/wine
./scripts/create_th08_prefix

Building

Run the following script:

python3 ./scripts/build.py

This will automatically generate a ninja build script build.ninja, and run ninja on it.

Diffing

Please read our Code of Conduct.

In order to contribute to the decompilation, you are going to need reccmp (Instructions).

In the project root, run:

reccmp-project detect --search-path resources/

Build the recompiled executable if you have not done so (see the above section). Then, in the build/ directory, run:

reccmp-project detect --what recompiled

To generate a report of the differences between the original and recompiled binaries, again in the build/ directory, run:

reccmp-reccmp --target th08 --html report.html

This will display a report of the accuracy to the original binary, and export this report to a HTML file report.html.

Credits

We would like to extend our thanks to the following individuals for their invaluable contributions:

• @EstexNT for porting the var_order pragma to MSVC7.