In the Metal Gear Solid universe, canonically, the characters are speaking Japanese. While the English dub is stellar (and we will get to that), the Japanese track aligns the game more closely with the tone of Metal Gear Solid 4 . It feels less like a localization and more like the original artistic vision.
Because the audio will now be in Japanese, you need English text to follow the story: Launch the game. From the main menu, navigate to > Display Settings . Ensure that Subtitles are turned ON . Troubleshooting Common Issues metal gear rising revengeance japanese voice mod