diff --git a/src/background/actions/setting.js b/src/background/actions/setting.js
deleted file mode 100644
index 7eeb5de..0000000
--- a/src/background/actions/setting.js
+++ /dev/null
@@ -1,20 +0,0 @@
-import actions from '../actions';
-import * as settingsStorage from 'shared/settings/storage';
-
-const load = async() => {
-  let value = await settingsStorage.loadValue();
-  return {
-    type: actions.SETTING_SET_SETTINGS,
-    value,
-  };
-};
-
-const setProperty = (name, value) => {
-  return {
-    type: actions.SETTING_SET_PROPERTY,
-    name,
-    value,
-  };
-};
-
-export { load, setProperty };
diff --git a/src/background/components/background.js b/src/background/components/background.js
index d933d7b..9ba733d 100644
--- a/src/background/components/background.js
+++ b/src/background/components/background.js
@@ -1,6 +1,5 @@
 import messages from 'shared/messages';
 import * as commandActions from 'background/actions/command';
-import * as settingActions from 'background/actions/setting';
 import * as findActions from 'background/actions/find';
 import * as tabActions from 'background/actions/tab';
 
@@ -38,11 +37,6 @@ export default class BackgroundComponent {
         commandActions.exec(sender.tab, message.text, settings.value),
       );
       return this.broadcastSettingsChanged();
-    case messages.SETTINGS_QUERY:
-      return Promise.resolve(this.store.getState().setting.value);
-    case messages.SETTINGS_RELOAD:
-      this.store.dispatch(settingActions.load());
-      return this.broadcastSettingsChanged();
     case messages.FIND_GET_KEYWORD:
       return Promise.resolve(find.keyword);
     case messages.FIND_SET_KEYWORD:
diff --git a/src/background/controllers/setting.js b/src/background/controllers/setting.js
new file mode 100644
index 0000000..9e6019e
--- /dev/null
+++ b/src/background/controllers/setting.js
@@ -0,0 +1,18 @@
+import SettingInteractor from '../usecases/setting';
+import ContentMessageClient from '../infrastructures/content-message-client';
+
+export default class SettingController {
+  constructor() {
+    this.settingInteractor = new SettingInteractor();
+    this.contentMessageClient = new ContentMessageClient();
+  }
+
+  getSetting() {
+    return this.settingInteractor.get();
+  }
+
+  async reload() {
+    await this.settingInteractor.reload();
+    this.contentMessageClient.broadcastSettingsChanged();
+  }
+}
diff --git a/src/background/domains/setting.js b/src/background/domains/setting.js
new file mode 100644
index 0000000..106ec0f
--- /dev/null
+++ b/src/background/domains/setting.js
@@ -0,0 +1,51 @@
+import DefaultSettings from '../../shared/settings/default';
+import * as settingsValues from '../../shared/settings/values';
+
+export default class Setting {
+  constructor({ source, json, form }) {
+    this.obj = {
+      source, json, form
+    };
+  }
+
+  get source() {
+    return this.obj.source;
+  }
+
+  get json() {
+    return this.obj.json;
+  }
+
+  get form() {
+    return this.obj.form;
+  }
+
+  value() {
+    let value = JSON.parse(DefaultSettings.json);
+    if (this.obj.source === 'json') {
+      value = settingsValues.valueFromJson(this.obj.json);
+    } else if (this.obj.source === 'form') {
+      value = settingsValues.valueFromForm(this.obj.form);
+    }
+    if (!value.properties) {
+      value.properties = {};
+    }
+    return { ...settingsValues.valueFromJson(DefaultSettings.json), ...value };
+  }
+
+  serialize() {
+    return this.obj;
+  }
+
+  static deserialize(obj) {
+    return new Setting({ source: obj.source, json: obj.json, form: obj.form });
+  }
+
+  static defaultSettings() {
+    return new Setting({
+      source: DefaultSettings.source,
+      json: DefaultSettings.json,
+      form: {},
+    });
+  }
+}
diff --git a/src/background/index.js b/src/background/index.js
index 619b076..69dbe06 100644
--- a/src/background/index.js
+++ b/src/background/index.js
@@ -1,4 +1,3 @@
-import * as settingActions from 'background/actions/setting';
 import BackgroundComponent from 'background/components/background';
 import OperationComponent from 'background/components/operation';
 import TabComponent from 'background/components/tab';
@@ -9,6 +8,7 @@ import promise from 'redux-promise';
 import * as versions from './shared/versions';
 
 import ContentMessageListener from './infrastructures/content-message-listener';
+import SettingController from './controllers/setting';
 
 const store = createStore(
   reducers,
@@ -31,8 +31,8 @@ const tabComponent = new TabComponent(store);
 const indicatorComponent = new IndicatorComponent(store);
 /* eslint-enable no-unused-vars */
 
-store.dispatch(settingActions.load());
-
 checkAndNotifyUpdated();
 
+new SettingController().reload();
+
 new ContentMessageListener().run();
diff --git a/src/background/infrastructures/content-message-client.js b/src/background/infrastructures/content-message-client.js
new file mode 100644
index 0000000..b3b37b4
--- /dev/null
+++ b/src/background/infrastructures/content-message-client.js
@@ -0,0 +1,12 @@
+import messages from '../../shared/messages';
+
+export default class ContentMessageClient {
+  async broadcastSettingsChanged() {
+    let tabs = await browser.tabs.query({});
+    for (let tab of tabs) {
+      browser.tabs.sendMessage(tab.id, {
+        type: messages.SETTINGS_CHANGED,
+      });
+    }
+  }
+}
diff --git a/src/background/infrastructures/content-message-listener.js b/src/background/infrastructures/content-message-listener.js
index a0ed66c..6236f1c 100644
--- a/src/background/infrastructures/content-message-listener.js
+++ b/src/background/infrastructures/content-message-listener.js
@@ -1,8 +1,10 @@
 import messages from '../../shared/messages';
 import CompletionsController from '../controllers/completions';
+import SettingController from '../controllers/setting';
 
 export default class ContentMessageListener {
   constructor() {
+    this.settingController = new SettingController();
     this.completionsController = new CompletionsController();
   }
 
@@ -22,13 +24,24 @@ export default class ContentMessageListener {
   onMessage(message) {
     switch (message.type) {
     case messages.CONSOLE_QUERY_COMPLETIONS:
-      return this.onConsoleQueryCompletions(message);
+      return this.onConsoleQueryCompletions(message.text);
+    case messages.SETTINGS_QUERY:
+      return this.onSettingsQuery();
+    case messages.SETTINGS_RELOAD:
+      return this.onSettingsReload();
     }
   }
 
-  async onConsoleQueryCompletions(message) {
-    let completions =
-      await this.completionsController.getCompletions(message.text);
+  async onConsoleQueryCompletions(line) {
+    let completions = await this.completionsController.getCompletions(line);
     return Promise.resolve(completions.serialize());
   }
+
+  onSettingsQuery() {
+    return this.settingController.getSetting();
+  }
+
+  onSettingsReload() {
+    return this.settingController.reload();
+  }
 }
diff --git a/src/background/infrastructures/memory-storage.js b/src/background/infrastructures/memory-storage.js
new file mode 100644
index 0000000..0a05928
--- /dev/null
+++ b/src/background/infrastructures/memory-storage.js
@@ -0,0 +1,11 @@
+const db = {};
+
+export default class MemoryStorage {
+  set(name, value) {
+    db[name] = value;
+  }
+
+  get(name) {
+    return db[name];
+  }
+}
diff --git a/src/background/repositories/persistent-setting.js b/src/background/repositories/persistent-setting.js
new file mode 100644
index 0000000..247ea6f
--- /dev/null
+++ b/src/background/repositories/persistent-setting.js
@@ -0,0 +1,16 @@
+import Setting from '../domains/setting';
+
+export default class SettingRepository {
+  save(settings) {
+    return browser.storage.local.set({ settings: settings.serialize() });
+  }
+
+  async load() {
+    let { settings } = await browser.storage.local.get('settings');
+    if (!settings) {
+      return null;
+    }
+    return Setting.deserialize(settings);
+  }
+}
+
diff --git a/src/background/repositories/setting.js b/src/background/repositories/setting.js
new file mode 100644
index 0000000..d9c481d
--- /dev/null
+++ b/src/background/repositories/setting.js
@@ -0,0 +1,17 @@
+import MemoryStorage from '../infrastructures/memory-storage';
+
+const CACHED_SETTING_KEY = 'setting';
+
+export default class SettingRepository {
+  constructor() {
+    this.cache = new MemoryStorage();
+  }
+
+  get() {
+    return Promise.resolve(this.cache.get(CACHED_SETTING_KEY));
+  }
+
+  update(value) {
+    return this.cache.set(CACHED_SETTING_KEY, value);
+  }
+}
diff --git a/src/background/usecases/setting.js b/src/background/usecases/setting.js
new file mode 100644
index 0000000..656fc3f
--- /dev/null
+++ b/src/background/usecases/setting.js
@@ -0,0 +1,31 @@
+import Setting from '../domains/setting';
+import PersistentSettingRepository from '../repositories/persistent-setting';
+import SettingRepository from '../repositories/setting';
+
+export default class SettingInteractor {
+  constructor() {
+    this.persistentSettingRepository = new PersistentSettingRepository();
+    this.settingRepository = new SettingRepository();
+  }
+
+  save(settings) {
+    this.persistentSettingRepository.save(settings);
+  }
+
+  get() {
+    return this.settingRepository.get();
+  }
+
+  async reload() {
+    let settings = await this.persistentSettingRepository.load();
+    if (!settings) {
+      settings = Setting.defaultSettings();
+    }
+
+    let value = settings.value();
+
+    this.settingRepository.update(value);
+
+    return value;
+  }
+}