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The game surpassed my expectations just from the depth of the career mode introduction. 

The Pugilist 2D Boxing Simulator Gameplay #1:

Tutorial on playing 2D Boxing Simulator on non-Japanese Windows computers:

Unfortunately unable to get it to run on Windows 11. Managed to unpack with WinRar and setting language to Japanese (Windows + E buttons) but trying to run the exe for 2D Boxing Simulator or Boxing with Graph results in an error with gibberish text (seen above).