Right-click on desktop -> NVIDIA Control Panel -> Manage 3D Settings -> Program Settings -> Add -> OneeChanbaraOrigin.exe, then set the following options:

Low Latency Mode: Ultra
Max Frame Rate: 60 FPS
Vertical sync: Fast

Make sure to click "apply" when done.

No known solutions.

Problem: The game is not rendering at native resolution when using 4K or above display modes.

Solution: Right-click on the game in your Steam library -> Manage -> Browse local files. Then right-click on OneeChanbaraOrigin.exe, Properties -> Compatibility -> Change high DPI settings -> High DPI scaling override -> Application.

See this thread for more info.

Problem: The game crashes upon beating the first boss.

(Ghetto) Solution: Disable anisotropic filtering in the game's display options.

Problem: The mouse cursor is constantly spinning and thus impossible to hide fully.

(Ghetto) Solution: Press the Windows Key on your keyboard, then click on the game's icon on the taskbar. The cursor will no longer be spinning and you can now tuck it away in a corner.

Alternatively, you can also use a third party tool to hide the mouse cursor automatically, for example AutoHideMouseCursor[www.softwareok.com].

Problem: The game is known to corrupt saves if it crashes.

(Ghetto) Solution: You should periodically back up your save folder. The location is the same as the game folder. Right-click on the game in your Steam library -> Manage -> Browse local files. You should see a "savedata" folder.

Problem: The game started in Japanese instead of English.

Solution: Follow these screenshots to change the language to English.