diff --git a/src/App.js b/src/App.js
index 7bc072e..180d8ea 100644
--- a/src/App.js
+++ b/src/App.js
@@ -48,6 +48,9 @@ class App extends Component {
         this.show_sidebar_bound=this.show_sidebar.bind(this);
         this.set_mode_bound=this.set_mode.bind(this);
         this.on_pressure_bound=this.on_pressure.bind(this);
+        // a silly self-deceptive approach to ban guests, enough to fool those muggles
+        //                     document             cookie                    'pku_ip_flag=yes'
+        this.inpku_flag=window[atob('ZG9jdW1lbnQ')][atob('Y29va2ll')].indexOf(atob('cGt1X2lwX2ZsYWc9eWVz'))!==-1;
     }
 
     on_pressure() {
@@ -94,9 +97,17 @@ class App extends Component {
                 <TokenCtx.Consumer>{(token)=>(
                     <div className="left-container">
                         <DeprecatedAlert token={token.value} />
-                        <Flow key={this.state.flow_render_key} show_sidebar={this.show_sidebar_bound}
-                              mode={this.state.mode} search_text={this.state.search_text} token={token.value}
-                        />
+                        {this.inpku_flag||token.value ?
+                            <Flow key={this.state.flow_render_key} show_sidebar={this.show_sidebar_bound}
+                                  mode={this.state.mode} search_text={this.state.search_text} token={token.value}
+                            /> :
+                            <div className="flow-item-row">
+                                <div className="box box-tip aux-margin">
+                                    <p>本网站仅限校内用户使用</p>
+                                    <p>请点击右上角的 <span className="icon icon-login" /> 按钮登录</p>
+                                </div>
+                            </div>
+                        }
                         <br />
                     </div>
                 )}</TokenCtx.Consumer>
diff --git a/src/Title.js b/src/Title.js
index dc44916..5b6206a 100644
--- a/src/Title.js
+++ b/src/Title.js
@@ -159,7 +159,7 @@ class ControlBar extends PureComponent {
 
 export function Title(props) {
     let date=new Date();
-    let is_eriri_birthday=(1+date.getMonth())===3 && date.getDate()===20;
+    let eriri_easteregg=(1+date.getMonth())===3 && date.getDate()===20 && !localStorage['REPLACE_ERIRI_WITH_URL'];
 
     return (
         <div className="title-bar">
@@ -169,7 +169,7 @@ export function Title(props) {
                         P大树洞
                     </p>
                     <p className="title-small">
-                        { is_eriri_birthday ?
+                        { eriri_easteregg ?
                             <span style={{backgroundColor: 'yellow'}}>3月20日是看板娘<a href="https://zh.moegirl.org/%E6%B3%BD%E6%9D%91%C2%B7%E6%96%AF%E5%AE%BE%E5%A1%9E%C2%B7%E8%8B%B1%E6%A2%A8%E6%A2%A8" target="_blank">英梨梨</a>的生日</span> :
                             "官方网页版"
                         }