Osaka Simulator fix v1.0

春日歩の通販生活 (Ayumu Kasuga's Mail Order Life, a.k.a. Osaka Simulator) now runs properly on modern Windows, and on Linux through Wine. No virtual machine or compatibility mode is needed.

What's fixed

• Runs at the right speed. The game no longer plays several times too fast. This was caused by a timer that broke once your PC had been on for more than a few hours, so it affected nearly every modern PC.
• Osaka looks right again. No more solid blue or missing hair, or invisible models.
• Readable window title. The title shows 春日歩の通販生活 instead of garbled text.
• Smooth speech-bubble window. The desktop speech-bubble mode now runs at 60 fps instead of about 35 on Windows.

Existing saves and settings keep working as they are.

Downloads

File	What it is
tsu_han.exe	The patched game. Replace the original with it.
tsu_han.dat	Optional: a completed save with every item bought, the ending already seen, and ¥326,680 to spend.

Scroll down this page to Assets to download the files.

Installing on Windows

1. Get the original game from the Internet Archive or My Abandonware. The patch has been tested on the Internet Archive version.
2. Open the folder where the game is installed. It contains tsu_han.exe and the folders animation, model and sound.
3. Rename the original tsu_han.exe to tsu_han_original.exe, so you can go back if you need to.
4. Copy the downloaded tsu_han.exe into the folder. Optionally also copy the downloaded tsu_han.dat save file.
5. If you ever turned on compatibility mode for the game, turn it off. Windows remembers the setting for that file location, so the new exe inherits it. Right-click tsu_han.exe → Properties → Compatibility → untick Run this program in compatibility mode.
6. Run tsu_han.exe.

Linux

Install Wine with 32-bit support (Ubuntu/Debian: sudo dpkg --add-architecture i386 && sudo apt install wine wine32). Replace the exe as above, then run it from the game folder:

wine tsu_han.exe

Tested with Wine 9.0 on Ubuntu 24.04, in both the normal window and the speech-bubble window.

macOS

This hasn't been tested yet. A Wine build that runs 32-bit Windows programs (such as CrossOver) should work the same way as on Linux. Reports are welcome.

Checksums (SHA-256)

File	SHA-256
Original tsu_han.exe	2bdf5be89f1ce01fbf9b5dc034e3ab4ee9c3960f2f508cc968a1a657c1f304d0
Patched tsu_han.exe	1de2a9ffc327b0a3dbbe3abbdcc77fdb711f72b119d7aa8c55ca132604426785
tsu_han.dat	56d21de3d51fe1b1e40582d5fa4aafb7f00dec9793e24a3a7c31695859ca6f79

If you'd rather patch the exe yourself, use patch_exe.py from this repository. It only accepts the original exe with the checksum above. The README explains how each fix works.

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The game belongs to its original authors (hirahira.net). This project is not affiliated with them.