diff --git a/data/src/main/java/one/nem/lacerta/source/pref/impl/CommonImpl.java b/data/src/main/java/one/nem/lacerta/source/pref/impl/CommonImpl.java
new file mode 100644
index 00000000..c8aa14e8
--- /dev/null
+++ b/data/src/main/java/one/nem/lacerta/source/pref/impl/CommonImpl.java
@@ -0,0 +1,4 @@
+package one.nem.lacerta.source.pref.impl;
+
+public class CommonImpl {
+}
diff --git a/data/src/main/java/one/nem/lacerta/source/pref/module/CommonModule.java b/data/src/main/java/one/nem/lacerta/source/pref/module/CommonModule.java
new file mode 100644
index 00000000..de34c426
--- /dev/null
+++ b/data/src/main/java/one/nem/lacerta/source/pref/module/CommonModule.java
@@ -0,0 +1,4 @@
+package one.nem.lacerta.source.pref.module;
+
+public class CommonModule {
+}
diff --git a/data/src/main/java/one/nem/lacerta/source/pref/repository/Common.java b/data/src/main/java/one/nem/lacerta/source/pref/repository/Common.java
new file mode 100644
index 00000000..357671fb
--- /dev/null
+++ b/data/src/main/java/one/nem/lacerta/source/pref/repository/Common.java
@@ -0,0 +1,5 @@
+package one.nem.lacerta.source.pref.repository;
+
+public interface Common {
+    // さまざまな用途で使うPref
+}