diff --git a/README.md b/README.md
index 7a5d390..aecc4b1 100644
--- a/README.md
+++ b/README.md
@@ -3,22 +3,22 @@
 This is a multi-platform port of `xsystem35`, a free implementation of
 AliceSoft's System 3.x game engine.
 
-## Compatiblity
+## Compatibility
 
 See the [game compatibility table](game_compatibility.md) for a list of games
-that can be played on xsystem35-sdl2.
+that can be played with xsystem35-sdl2.
 
 ## Unique Features
 
-In addition to the original System 3.x's functionalities, xsystem35-sdl2 has
-the following features.
+In addition to the original System 3.x functionalities, xsystem35-sdl2 offers
+the following features:
 
-### Playing audio files as fake CD music
+### Playing Audio Files as Virtual CD Music
 
-Many System 3.x games had music as audio tracks on the CD-ROM. Xsystem35 can
-play music from audio files instead, to avoid the hassle of inserting CDs. To
-use ripped audio files, create a file named `playlist.txt` in the game
-directory, and enter the paths to your tracks, one per line. For example:
+Many System 3.x games feature music as audio tracks on the CD-ROM. xsystem35
+can play music from audio files, eliminating the need to insert CDs. To use
+ripped audio files, create a file named `playlist.txt` in the game directory
+and list the paths to your tracks, one per line. For example:
 
 ```
 # The first line is not used
@@ -27,98 +27,109 @@ BGM/track03.mp3
 ...
 ```
 
-The first line is not used, because track 1 of game CD is usually a data track.
+The first line is not used because the first track on a game CD is typically a
+data track.
 
-Some games have the music integrated as MIDI, if this is the case the music
-won't play using the fake CD. If you get `Cannot load MIDI` error message, SDL
-might need to use the `SDL_SOUNDFONTS` environment variable, set
-`SDL_SOUNDFONTS` to point to a sf2 file. For example:
+Some games have integrated music as MIDI. In such cases, the music won't play
+using the virtual CD feature. If you encounter a `Cannot load MIDI` error
+message, you might need to set the `SDL_SOUNDFONTS` environment variable to
+point to an `.sf2` file. For example:
 
 ```
 SDL_SOUNDFONTS=/usr/share/soundfonts/GeneralUser.sf2 xsystem35
 ```
 
-### Unicode translation support
+### Unicode Translation Support
 
-The original System 3.x only supported Shift_JIS (a Japanese character
-encoding), but xsystem35 supports Unicode and is able to run games translated
-into languages other than Japanese and English.
+While the original System 3.x only supported Shift_JIS (a Japanese character
+encoding), xsystem35 supports Unicode and can run games translated into
+languages other than Japanese and English.
 
-See [xsys35c](https://github.com/kichikuou/xsys35c)'s document for how to
-build a game with Unicode mode.
+For instructions on how to build a game with Unicode support, see the
+[xsys35c](https://github.com/kichikuou/xsys35c) documentation.
 
 ### Debugging
 
-Xsystem35 has a built-in debugger that allows you to step through the game and
-examine / modify variables in the game. There are two ways to use the debugger:
+xsystem35 features a built-in debugger that allows you to step through the game
+and examine or modify game variables. There are two ways to use the debugger:
 
 - Through [Visual Studio Code](https://code.visualstudio.com/) (recommended):
   The [vscode-system3x](https://github.com/kichikuou/vscode-system3x) extension
-  provides graphical debugging interface for System 3.x.
-- Using CUI debugger: Running xsystem35 with `-debug` option will start the
-  debugger with console interface. Type `help` to see a list of available
-  commands.
+  provides a graphical debugging interface for System 3.x.
+- Using the CLI Debugger: Running xsystem35 with the `-debug` option will
+  launch the debugger with a console interface. Type `help` to see a list of
+  available commands.
 
-## Installing
+## Installation
 
 Prebuilt packages for Windows and Android can be downloaded from the
 [Releases](https://github.com/kichikuou/xsystem35-sdl2/releases) page. For
-other platforms, see the [Building](#building) section.
+other platforms, refer to the [Building](#building) section.
 
 ## Running
 ### Windows
 
-Execute `xsytem35`, and it will show a dialog to select a folder. Select the
-game folder (where the ALD files are located).
+Execute `xsystem35`, and a dialog will appear for you to select a folder.
+Choose the game folder (where the ALD files are located).
 
 ### Android
 
-See [android/README.md](https://github.com/kichikuou/xsystem35-sdl2/blob/master/android/README.md#use).
+See [android/README.md](android/README.md#use).
 
 ### Other Platforms
 
 Run xsystem35 from within the game directory.
 
-    cd /path/to/game_directory
-    xsystem35
+```bash
+$ cd /path/to/game_directory
+$ xsystem35
+```
 
 ## Building
 ### Linux (Debian / Ubuntu)
 
-    $ sudo apt install build-essential cmake libgtk-3-dev libsdl2-dev libsdl2-ttf-dev libsdl2-mixer-dev libwebp-dev libcjson-dev
-    $ mkdir -p out/debug
-    $ cd out/debug
-    $ cmake -DCMAKE_BUILD_TYPE=Debug ../../
-    $ make && make install
+```bash
+$ sudo apt install build-essential cmake libgtk-3-dev libsdl2-dev libsdl2-ttf-dev libsdl2-mixer-dev libwebp-dev libcjson-dev
+$ mkdir -p out/debug
+$ cd out/debug
+$ cmake -DCMAKE_BUILD_TYPE=Debug ../../
+$ make && make install
+```
 
 ### MacOS
 
-[Homebrew](https://brew.sh/index_ja) is needed.
+[Homebrew](https://brew.sh/) is required.
 
-    $ brew install cmake pkg-config sdl2 sdl2_mixer sdl2_ttf webp cjson
-    $ mkdir -p out/debug
-    $ cd out/debug
-    $ cmake -DCMAKE_BUILD_TYPE=Debug ../../
-    $ make && make install
+```bash
+$ brew install cmake pkg-config sdl2 sdl2_mixer sdl2_ttf webp cjson
+$ mkdir -p out/debug
+$ cd out/debug
+$ cmake -DCMAKE_BUILD_TYPE=Debug ../../
+$ make && make install
+```
 
 ### Windows
 
-[MSYS2](https://www.msys2.org) is needed.
+[MSYS2](https://www.msys2.org) is required.
 
-    $ pacman -S cmake mingw-w64-x86_64-cmake mingw-w64-x86_64-SDL2 mingw-w64-x86_64-SDL2_ttf mingw-w64-x86_64-SDL2_mixer mingw-w64-x86_64-libwebp mingw-w64-x86_64-cjson
-    $ mkdir -p out/debug
-    $ cd out/debug
-    $ cmake -G"MSYS Makefiles" -DCMAKE_BUILD_TYPE=Debug ../../
-    $ make
+```bash
+$ pacman -S cmake mingw-w64-x86_64-cmake mingw-w64-x86_64-SDL2 mingw-w64-x86_64-SDL2_ttf mingw-w64-x86_64-SDL2_mixer mingw-w64-x86_64-libwebp mingw-w64-x86_64-cjson
+$ mkdir -p out/debug
+$ cd out/debug
+$ cmake -G"MSYS Makefiles" -DCMAKE_BUILD_TYPE=Debug ../../
+$ make
+```
 
 ### Emscripten
 
-    $ mkdir -p out/wasm
-    $ cd out/wasm
-    $ emcmake cmake -DCMAKE_BUILD_TYPE=MinSizeRel ../../
-    $ make
+```bash
+$ mkdir -p out/wasm
+$ cd out/wasm
+$ emcmake cmake -DCMAKE_BUILD_TYPE=MinSizeRel ../../
+$ make
+```
 
-To use the generated binary, checkout
+To use the generated binary, check out
 [Kichikuou on Web](https://github.com/kichikuou/web) and copy `out/xsystem35.*`
 into its `docs` directory.
 
diff --git a/android/README.md b/android/README.md
index 5a4a316..6a73ca2 100644
--- a/android/README.md
+++ b/android/README.md
@@ -1,7 +1,8 @@
 # xsystem35 for Android
 
 ## Download
-Prebuilt APKs are [here](https://github.com/kichikuou/xsystem35-sdl2/releases).
+You can download prebuilt APKs
+[here](https://github.com/kichikuou/xsystem35-sdl2/releases).
 
 ## Build
 Prerequisites:
@@ -11,8 +12,8 @@ Prerequisites:
 ### Using Android Studio
 Open this directory as an Android Studio project.
 
-### Command line build
-Configure environment variables and run the `gradlew` script in this folder.
+### Command Line Build
+Set environment variables and run the `gradlew` script in this directory.
 
 Example build instructions (for Debian bookworm):
 ```sh
@@ -25,35 +26,48 @@ mkdir -p $ANDROID_SDK_ROOT/cmdline-tools
 wget https://dl.google.com/android/repository/commandlinetools-linux-10406996_latest.zip
 unzip commandlinetools-linux-10406996_latest.zip -d $ANDROID_SDK_ROOT/cmdline-tools
 mv $ANDROID_SDK_ROOT/cmdline-tools/cmdline-tools $ANDROID_SDK_ROOT/cmdline-tools/tools
-yes |$ANDROID_SDK_ROOT/cmdline-tools/tools/bin/sdkmanager --licenses
+yes | $ANDROID_SDK_ROOT/cmdline-tools/tools/bin/sdkmanager --licenses
 $ANDROID_SDK_ROOT/cmdline-tools/tools/bin/sdkmanager ndk-bundle 'cmake;3.22.1'
 export ANDROID_NDK_HOME=$ANDROID_SDK_ROOT/ndk-bundle
 
-# Check out and build xsystem35
+# Clone and build xsystem35
 git clone https://github.com/kichikuou/xsystem35-sdl2.git
 cd xsystem35-sdl2/android
 ./gradlew build  # or ./gradlew installDebug if you have a connected device
 ```
 
-## Use
+## Usage
 ### Basic Usage
-1. Create a ZIP file containing all the game files and BGM files (see [below](#preparing-a-zip) for details), and transfer it to your device.
-2. Open the app. A list of installed games is displayed. Since nothing has been installed yet, only the "Install from ZIP" button is displayed. Tap it.
-3. Select the ZIP file you created in 1.
-4. The game starts. To simulate right-click, tap the black bars on the left/right or top/bottom of the screen.
+1. Create a ZIP file containing all the game files and BGM files (see
+   [below](#preparing-a-zip) for details), and transfer it to your device.
+2. Open the app. A list of installed games will be displayed. Since no games
+   have been installed yet, only the "Install from ZIP" button will be visible.
+   Tap it.
+3. Select the ZIP file you created in step 1.
+4. The game will start. To simulate a right-click, tap the black bars on either
+   the left or right, or top or bottom of the screen.
 
 ### Preparing a ZIP
-- Include all files in the `GAMEDATA` folder (`.ALD` files and others). `.EXE` and `.DLL` are not really needed, but you can include them as well.
-- Music files (`.mp3`, `.ogg` or `.wav`) whose file names end with a number are recognized as BGM files. For example:
+- Include all files from the `GAMEDATA` folder (such as `.ALD` files and
+  others). `.EXE` and `.DLL` files are not necessary, but you can include them
+  if you want.
+- Music files (`.mp3`, `.ogg`, or `.wav`) whose filenames end with a number
+  will be recognized as BGM files. For example:
   - `Track2.mp3`
   - `15.ogg`
-  - `rance4_03.wav` (This shouldn't be `rance403.wav`, because it would be treated as the 403rd track)
+  - `rance4_03.wav` (Note: The filename shouldn't be `rance403.wav`, as it
+    would be treated as the 403rd track.)
 
-Note: This form of ZIP can be used in [Kichikuou on Web](http://kichikuou.github.io/web/) as well.
+Note: This ZIP format is also compatible with
+[Kichikuou on Web](http://kichikuou.github.io/web/).
 
 ### Miscellaneous
-- You can export / import saved files using the option menu of the game list.
-- To uninstall a game, long-tap the title in the game list.
+- You can export or import save files via the game list's option menu.
+- To uninstall a game, long-tap its title in the game list.
 
 ## Known Issues
-- Android versions older than 7.0 cannot handle ZIPs containing Shift-JIS file names. This is the case with some ZIPs distributed on [retroc.net](http://retropc.net/alice/). If you get the error "This type of ZIP is not supported.", unzip the ZIP file on your PC and re-archive it with a modern ZIP creation software.
+- Android versions older than 7.0 cannot handle ZIP files containing Shift-JIS
+  filenames. This issue occurs with some ZIP files distributed on
+  [retroc.net](http://retropc.net/alice/). If you encounter the error message
+  "This type of ZIP is not supported," unzip the file on your PC and re-archive
+  it using modern ZIP creation software.