diff --git a/src/client/accessor/util.ts b/src/client/accessor/util.ts
index 7f746b8..f9bd1ad 100644
--- a/src/client/accessor/util.ts
+++ b/src/client/accessor/util.ts
@@ -14,4 +14,22 @@ export const toQueryString = (obj:ToQueryStringA)=> {
             ? e[1].map(f=>`${e[0]}[]=${encodeURIComponent(f)}`).join('&') 
             : `${e[0]}=${encodeURIComponent(e[1])}`)
         .join('&');
+}
+export const QueryStringToMap = (query:string) =>{
+    const keyValue = query.slice(query.indexOf("?")+1).split("&");
+    const param:{[k:string]:string|string[]} = {};
+    keyValue.forEach((p)=>{
+        const [k,v] = p.split("=");
+        if(k.endsWith("[]")){
+            let arr = param[k];
+            if(arr instanceof Array){
+                arr.push(v);
+            }
+            else{
+                param[k] = [v];
+            }
+        }
+        else param[k] = v;
+    });
+    return param;
 }
\ No newline at end of file
diff --git a/src/client/app.tsx b/src/client/app.tsx
index 10c1a26..d96f9af 100644
--- a/src/client/app.tsx
+++ b/src/client/app.tsx
@@ -1,23 +1,28 @@
-import React, { useRef, useState } from 'react';
+import React, { createContext, useRef, useState } from 'react';
 import ReactDom from 'react-dom';
 import {BrowserRouter, Route, Switch as RouterSwitch} from 'react-router-dom';
 import { Gallery, ContentAbout} from './page/mod';
+import {BackLinkContext} from './state';
 
 import './css/style.css';
 
 const FooProfile = ()=><div>test profile</div>;
 const App = () => {
-    return (<BrowserRouter>
-            <RouterSwitch>
-                <Route path="/" exact render={()=><Gallery />}></Route>
-                <Route path="/search" render={()=><Gallery />}></Route>
-                <Route path="/doc" render={(prop)=><ContentAbout {...prop}/>}></Route>
-                <Route path="/profile" component={FooProfile}></Route>
-                <Route>
-                    <div>404 Not Found</div>
-                </Route>
-            </RouterSwitch>
-    </BrowserRouter>);
+    const [path,setPath] = useState("/");
+    return (
+    <BackLinkContext.Provider value={{path:path,setPath:setPath}}>
+        <BrowserRouter>
+                <RouterSwitch>
+                    <Route path="/" exact render={()=><Gallery />}></Route>
+                    <Route path="/search" render={()=><Gallery />}></Route>
+                    <Route path="/doc" render={(prop)=><ContentAbout {...prop}/>}></Route>
+                    <Route path="/profile" component={FooProfile}></Route>
+                    <Route>
+                        <div>404 Not Found</div>
+                    </Route>
+                </RouterSwitch>
+        </BrowserRouter>
+    </BackLinkContext.Provider>);
 };
 
 ReactDom.render(
diff --git a/src/client/page/contentinfo.tsx b/src/client/page/contentinfo.tsx
index a14112f..e178dc4 100644
--- a/src/client/page/contentinfo.tsx
+++ b/src/client/page/contentinfo.tsx
@@ -1,4 +1,4 @@
-import React, { useState, useEffect } from 'react';
+import React, { useState, useEffect, useContext } from 'react';
 import { Redirect, Route, Switch, useHistory, useRouteMatch, match as MatchType, Link as RouterLink, useParams, useLocation } from 'react-router-dom';
 import ContentAccessor, { Content } from '../accessor/contents';
 import { LoadingCircle } from '../component/loading';
@@ -6,6 +6,7 @@ import { Link, Paper, makeStyles, Theme, Box, useTheme, Typography } from '@mate
 import {ArrowBack as ArrowBackIcon } from '@material-ui/icons';
 import { MangaReader } from './reader/manga';
 import { ContentInfo, Headline, NavItem, NavList } from '../component/mod';
+import {BackLinkContext} from '../state';
 
 export const makeContentInfoUrl = (id: number) => `/doc/${id}`;
 export const makeMangaReaderUrl = (id: number) => `/doc/${id}/reader`;
@@ -24,9 +25,15 @@ export const ContentAbout = (prop: { match: MatchType }) => {
     const [info, setInfo] = useState<ContentState>({ content: undefined, notfound:false });
     const location = useLocation();
     console.log("state : "+location.state);
-    const menu_list = (
+    const menu_list = (link?:string)=>(
         <NavList>
-            <NavItem name="Back" to="/" icon={<ArrowBackIcon/>}></NavItem>
+            <BackLinkContext.Consumer>
+            {
+                (ctx) => link === undefined ?
+                <NavItem name="Back" to={ctx.path} icon={<ArrowBackIcon/>}/>
+                : <NavItem name="Back" to={link} icon={<ArrowBackIcon/>}/>
+            }
+            </BackLinkContext.Consumer>
         </NavList>
     );
 
@@ -42,39 +49,43 @@ export const ContentAbout = (prop: { match: MatchType }) => {
     }, []);
     if (isNaN(id)) {
         return (
-            <Headline menu={menu_list}>
+            <Headline menu={menu_list()}>
                 <Typography variant='h2'>Oops. Invalid ID</Typography>
             </Headline>
         );
     }
     else if(info.notfound){
         return (
-            <Headline menu={menu_list}>
+            <Headline menu={menu_list()}>
                 <Typography variant='h2'>Content has been removed.</Typography>
             </Headline>
         )
     }
     else if (info.content === undefined) {
-        return (<Headline menu={menu_list}>
+        return (<Headline menu={menu_list()}>
             <LoadingCircle />
         </Headline>
         );
     }
-    else return (<Switch>
+    else{
+
+        return (<Switch>
         <Route exact path={`${prop.match.path}/:id`}>
-            <Headline menu={menu_list}>
+            
+            <Headline menu={menu_list()}>
                 <ContentInfo content={info.content}></ContentInfo>
             </Headline>
         </Route>
         <Route exact path={`${prop.match.path}/:id/reader`}>
-            <Headline menu={menu_list}>
+            <Headline menu={menu_list(`${prop.match.path}/${id}`)}>
                 <MangaReader content={info.content}></MangaReader>
             </Headline>
         </Route>
         <Route>
-            <Headline menu={menu_list}>
+            <Headline menu={menu_list()}>
                 <div>404 Not Found invalid url : {prop.match.path}</div>
             </Headline>
         </Route>
     </Switch>);
+    }
 }
\ No newline at end of file
diff --git a/src/client/page/gallery.tsx b/src/client/page/gallery.tsx
index 00c909b..fb26106 100644
--- a/src/client/page/gallery.tsx
+++ b/src/client/page/gallery.tsx
@@ -1,14 +1,22 @@
-import React from 'react';
+import React, { useContext } from 'react';
 import { NavList, NavItem, Headline } from '../component/mod';
 import {ArrowBack as ArrowBackIcon} from '@material-ui/icons';
 import {GalleryInfo} from '../component/mod';
+import {BackLinkContext} from '../state';
+import {useLocation} from 'react-router-dom';
+import { QueryStringToMap } from '../accessor/util';
 
 export const Gallery = ()=>{
+    const location = useLocation();
+    const backctx = useContext(BackLinkContext);
+    backctx.setPath("/");
+    
+    const query = QueryStringToMap(location.search);
     const menu_list = (<NavList>
-        <NavItem name="Back" to="" icon={<ArrowBackIcon></ArrowBackIcon>}></NavItem>
+        {Object.keys(query).length !== 0 && <NavItem name="Back" to="/" icon={<ArrowBackIcon></ArrowBackIcon>}></NavItem>}
     </NavList>);
 
     return (<Headline menu={menu_list}>
-        <GalleryInfo></GalleryInfo>
+        <GalleryInfo option={query}></GalleryInfo>
     </Headline>)
 }
\ No newline at end of file
diff --git a/src/client/page/reader/manga.tsx b/src/client/page/reader/manga.tsx
index aab0f07..9eb9f3e 100644
--- a/src/client/page/reader/manga.tsx
+++ b/src/client/page/reader/manga.tsx
@@ -22,7 +22,7 @@ export const MangaReader = (props:{content:Content})=>{
         return <Typography>Error. DB error. page restriction</Typography>
     }
     const page:number = additional['page'] as number;
-    return (<div>{[...Array(page).keys()].map(x=>(<img src={`/content/${props.content.id}/manga/${x}`} style={{maxHeight:'100%',maxWidth:'100%'}}></img>))}</div>);
+    return (<div>{[...Array(page).keys()].map(x=>(<img src={`/content/${props.content.id}/manga/${x}`} key={x} style={{maxHeight:'100%',maxWidth:'100%'}}></img>))}</div>);
 }
 
 export default MangaReader;
\ No newline at end of file
diff --git a/src/client/state.tsx b/src/client/state.tsx
new file mode 100644
index 0000000..6f31cf5
--- /dev/null
+++ b/src/client/state.tsx
@@ -0,0 +1,3 @@
+import React, { createContext, useRef, useState } from 'react';
+
+export const BackLinkContext = createContext({path:"",setPath:(s:string)=>{}});
\ No newline at end of file
diff --git a/src/server.ts b/src/server.ts
index d7aba7a..5a01c22 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -47,6 +47,12 @@ async function main(){
         ctx.body = index_html;
     }
     );
+    router.get('/search'
+        ,async (ctx,next)=>{
+        ctx.type = "html";
+        ctx.body = index_html;
+    }
+    );
     let content_router = getContentRouter(createKnexContentsAccessor(db));
     router.use('/content',content_router.routes());
     router.use('/content',content_router.allowedMethods());