diff --git a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
index fe8773ca..a4e91fd7 100644
--- a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
+++ b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
@@ -28,320 +28,13 @@ import one.nem.lacerta.utils.LacertaLogger;
 
 public class FileManagerImpl implements FileManager {
 
-    // RootDir
-    private Path rootDir;
-
-    // CurrentDir
-    private Path currentDir;
-
-    // Internal Methods
-    private Path convertPath(String path) {
-        Path convertedPath = currentDir.resolve(path);
-        if (convertedPath.startsWith(rootDir)) { // 異常なパスの場合はnullを返す // TODO-rca: エラーハンドリング
-            return convertedPath;
-        } else {
-            return null;
-        }
-    }
-
     // Injection
     private LacertaLogger logger;
 
     @AssistedInject
     public FileManagerImpl(LacertaLogger logger, @Assisted Path rootDir) {
         this.logger = logger;
-        this.rootDir = rootDir;
-        this.currentDir = rootDir;
     }
 
-    @Override
-    public Path getRootDir() {
-        return rootDir;
-    }
-
-    @Override
-    public Path getCurrentDir() {
-        return currentDir;
-    }
-
-    @Override
-    public void changeDir(String dirName) {
-        this.currentDir = rootDir.resolve(dirName);
-    }
-
-    @Override
-    public void changeDir(Path path) {
-        if (path.startsWith(rootDir)) {
-            this.currentDir = path;
-        }
-        else {
-            logger.debug("changeDir", "invalid path: " + path);
-            // TODO-rca: 例外を投げる
-        }
-    }
-
-    @Override
-    public void backDir() {
-        this.currentDir = currentDir.getParent();
-    }
-
-    @Override
-    public void backRootDir() {
-        this.currentDir = rootDir;
-    }
-
-    @Override
-    public List<Path> getList() {
-        List<Path> list = new ArrayList<>();
-        try (DirectoryStream<Path> stream = Files.newDirectoryStream(currentDir)) {
-            for (Path entry : stream) { // TODO-rca: エラーハンドリング, 効率化
-                list.add(entry);
-            }
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-        return list;
-    }
-
-    @Override
-    public void createDir(String dirName) {
-        //ディレクトリ作成
-        logger.debug("createDir", "called");
-
-        Path path = currentDir.resolve(dirName);
-        logger.debug("createDir", "path: " + path);
-        try {
-            Files.createDirectory(path);
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
-
-    @Override
-    public void createDir(Path path) {
-        logger.debug("createDir", "called");
-        try {
-            Files.createDirectory(path);
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
-
-    @Override
-    public void removeDir(String dirName) {
-        logger.debug("removeDir", "called");
-        currentDir.resolve(dirName).toFile().delete(); // TODO-rca: エラーハンドリング
-    }
-
-    @Override
-    public void removeDir(Path path) {
-        logger.debug("removeDir", "called");
-        path.toFile().delete(); // TODO-rca: エラーハンドリング
-    }
-
-
-    @Override
-    public File createFile(String fileName) {
-        logger.debug("createFile", "called");
-        return currentDir.resolve(fileName).toFile();
-    }
-
-    @Override
-    public void removeFile(String fileName) {
-        logger.debug("removeFile", "called");
-        currentDir.resolve(fileName).toFile().delete(); // TODO-rca: エラーハンドリング
-    }
-
-    @Override
-    public File getFile(String fileName) {
-        logger.debug("getFile", "called");
-        return currentDir.resolve(fileName).toFile();
-    }
-
-    @Override
-    public File getFile(Path path) {
-        logger.debug("getFile", "called");
-        return path.toFile();
-    }
-
-    @Override
-    public String loadText(String fileName) { // TODO-rca: 統合
-        try(FileInputStream fileInputStream = new FileInputStream(currentDir.resolve(fileName).toFile())) {
-            byte[] bytes = new byte[fileInputStream.available()];
-            fileInputStream.read(bytes); // TODO-rca: エラーハンドリング
-            return new String(bytes);
-        } catch (IOException e) {
-            e.printStackTrace();
-            return null;
-        }
-    }
-
-    @Override
-    public String loadText(Path path) {
-        try(FileInputStream fileInputStream = new FileInputStream(path.toFile())) {
-            byte[] bytes = new byte[fileInputStream.available()];
-            fileInputStream.read(bytes); // TODO-rca: エラーハンドリング
-            return new String(bytes);
-        } catch (IOException e) {
-            e.printStackTrace();
-            return null;
-        }
-    }
-
-    @Override
-    public void saveText(String text, String fileName) { // TODO-rca: リファクタリング // TODO-rca: 統合
-        if (isExist(fileName)) {
-            logger.debug("saveText", "file already exists");
-            // Overwrite
-            try {
-                Files.write(currentDir.resolve(fileName), text.getBytes());
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-        else {
-            try {
-                Files.createFile(currentDir.resolve(fileName));
-                Files.write(currentDir.resolve(fileName), text.getBytes());
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-
-    }
-
-    @Override
-    public void saveText(String text, Path path) {
-        if (isExist(path)) {
-            logger.debug("saveText", "file already exists");
-            // Overwrite
-            try {
-                Files.write(path, text.getBytes());
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-        else {
-            try {
-                Files.createFile(path);
-                Files.write(path, text.getBytes());
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-    }
-
-    @Override
-    public void saveDocument(Document document, String fileName) {
-        try {
-            TransformerFactory transformerFactory = TransformerFactory.newInstance();
-            Transformer transformer = transformerFactory.newTransformer();
-            DOMSource source = new DOMSource(document);
-            File file = createFile(fileName);
-            StreamResult result = new StreamResult(file);
-            transformer.transform(source, result);
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-    }
-
-    @Override
-    public void saveDocument(Document document, Path path) {
-        // TODO-rca 実装する
-    }
-
-    @Override
-    public Document loadDocument(String fileName) {
-        try {
-            File file = getFile(fileName);
-            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
-            DocumentBuilder builder = factory.newDocumentBuilder();
-            Document document = builder.parse(file);
-            return document;
-        } catch (Exception e) {
-            e.printStackTrace();
-            return null;
-        }
-    }
-
-    @Override
-    public Document loadDocument(Path path) {
-        // TODO-rca 実装する
-        return null;
-    }
-
-    @Override
-    public boolean isExist(Path path) {
-        logger.debug("isExist", "called");
-        return Files.exists(path);
-    }
-
-    @Override
-    public boolean isExist(String fileName) {
-        logger.debug("isExist", "called");
-        return Files.exists(currentDir.resolve(fileName));
-    }
-
-    @Override
-    public void autoCreateDir(Path path) {
-        logger.debug("autoCreateDir", "called");
-        if (!Files.exists(path)) {
-            try {
-                Files.createDirectories(path);
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-    }
-
-    @Override
-    public void autoCreateDir(String dirName) {
-        logger.debug("autoCreateDir", "called");
-        if (!Files.exists(currentDir.resolve(dirName))) {
-            try {
-                Files.createDirectories(currentDir.resolve(dirName));
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-    }
-
-    @Override
-    public void autoCreateToCurrentDir() {
-        logger.debug("autoGenerateToCurrentDir", "called");
-        if (isExist(currentDir)) {
-            logger.debug("autoGenerateToCurrentDir", "currentDir already exists");
-            return;
-        }
-        else {
-            try {
-                Files.createDirectories(currentDir);
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-    }
-
-
-    @Override
-    public void saveBitmapAtCurrent(Bitmap bitmap, String fileName) { // TODO-rca: ファイル形式を変更できるようにする？
-        logger.debug("saveBitmapAtCurrent", "called");
-        try {
-            File file = currentDir.resolve(fileName).toFile();
-            bitmap.compress(Bitmap.CompressFormat.PNG, 100, Files.newOutputStream(file.toPath()));
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
-
-    @Override
-    public Bitmap loadBitmap(Path path) {
-        return null;
-    }
-
-    @Override
-    public void removeBitmap(Path path) {
-
-    }
 
 }