Many PSX games rely on Red Book audio for music. A low-quality rip might remove the background music to save space. A "top" ISO preserves the full audio tracks.
You do not need to know Japanese to play. The menus are largely icon-based. However, here is a quick guide: yakyuken special psx iso top
You need the scph5500.bin (Japan BIOS) for optimal compatibility. Place it in your emulator’s bios folder. Many PSX games rely on Red Book audio for music
You have the ISO. Now, where does it run best? Here are the top platforms for this PSX gem. yakyuken special psx iso top