diff --git a/data/src/main/java/one/nem/lacerta/data/impl/LacertaLibraryImpl.java b/data/src/main/java/one/nem/lacerta/data/impl/LacertaLibraryImpl.java
index 0c78b2e6..82747715 100644
--- a/data/src/main/java/one/nem/lacerta/data/impl/LacertaLibraryImpl.java
+++ b/data/src/main/java/one/nem/lacerta/data/impl/LacertaLibraryImpl.java
@@ -32,6 +32,13 @@ public class LacertaLibraryImpl implements LacertaLibrary {
     @Override
     public CompletableFuture<ArrayList<ListItem>> getRecentDocument(int limit) {
         return CompletableFuture.supplyAsync(() -> {
+            // 5秒フリーズさせる
+            try {
+                Thread.sleep(5000);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+
             List<DocumentEntity> documentEntities = database.documentDao().getRecentDocument(limit);
 
             ArrayList<ListItem> listItems = new ArrayList<>();