diff --git a/src/locales/jp.json b/src/locales/jp.json
index 30ec264..f486352 100644
--- a/src/locales/jp.json
+++ b/src/locales/jp.json
@@ -11,6 +11,9 @@
   "pages": {
     "screening": {
       "nodes": {
+        "base": {
+          "remove": "削除"
+        },
         "fetch_ToshoListed": {
           "title": "東証上場銘柄一覧"
         },
diff --git a/src/pages/Screening.tsx b/src/pages/Screening.tsx
index 9155c2c..6a48d34 100644
--- a/src/pages/Screening.tsx
+++ b/src/pages/Screening.tsx
@@ -1,38 +1,59 @@
-import { useCallback } from "react";
-import { Background, Controls, ReactFlow, Node, useNodesState, useEdgesState, addEdge, Connection } from "@xyflow/react";
+import { useCallback, useMemo } from "react";
+import { Background, Controls, Edge, ReactFlow, Node, useNodesState, useEdgesState, Connection } from "@xyflow/react";
 import * as node from "./node/";
 
 import "@xyflow/react/dist/style.css";
 
-import { History, Impl as HistoryImpl } from "./context/History";
+import { Editor, Impl as EditorImpl } from "./context/Editor";
 
 const nodeTypes = {
   fetch_ToshoListed: node.fetch.ToshoListed,
   present_TableDisplay: node.present.TableDisplay,
 };
 const initialNodes: Node[] = [
-  {id: "n1", type: "fetch_ToshoListed", position: {x:0, y:0}, data: {prime: true, standard: true, growth: true}},
-  {id: "n2", type: "present_TableDisplay",  position: {x:0, y:100}, data: {}},
-  {id: "n3", position: {x:0, y:200}, data: {label: "hello"}},
+  {
+    id: "n1",
+    type: "fetch_ToshoListed",
+    position: {x:0, y:0},
+    data: {prime: true, standard: true, growth: true},
+    deletable: false,
+  },
+  {
+    id: "n2",
+    type: "present_TableDisplay",
+    position: {x:0, y:100},
+    data: {},
+  },
+  {
+    id: "n3",
+    position: {x:0, y:200},
+    data: {label: "hello"},
+  },
 ];
 
 export default function Screening() {
   const [nodes, setNodes, onNodesChange] = useNodesState(initialNodes);
-  const [edges, setEdges, onEdgesChange] = useEdgesState([]);
+  const [edges, setEdges, onEdgesChange] = useEdgesState([] as Edge[]);
+
+  const editor = useMemo(()=>new EditorImpl(setNodes, setEdges, 100), []);
 
   const onConnect = useCallback(
-    (connection: Connection) => setEdges((eds) => addEdge(connection, eds)),
-    []
-  );
+    (conn: Connection)=>editor.connect(conn), []);
+  const onDisconnect = useCallback(
+    (conns: Edge[])=>editor.disconnect(conns.map((x)=>x as Connection)), []);
+  const onNodesDelete = useCallback(
+    (nodes: Node[])=>editor.remove(nodes.map((x)=>x.id)), []);
 
   return (
-    <History.Provider value={new HistoryImpl(setNodes)}>
+    <Editor.Provider value={editor}>
       <div style={{ position: "absolute", left: 0, right: 0, top: 0, bottom: 0 }}>
         <ReactFlow
           nodeTypes={nodeTypes}
           nodes={nodes}
           edges={edges}
+          onNodesDelete={onNodesDelete}
           onNodesChange={onNodesChange}
+          onEdgesDelete={onDisconnect}
           onEdgesChange={onEdgesChange}
           onConnect={onConnect}
           fitView
@@ -41,6 +62,6 @@ export default function Screening() {
           <Background />
         </ReactFlow>
       </div>
-    </History.Provider>
+    </Editor.Provider>
   );
 }
diff --git a/src/pages/context/Editor.tsx b/src/pages/context/Editor.tsx
new file mode 100644
index 0000000..52e7c5e
--- /dev/null
+++ b/src/pages/context/Editor.tsx
@@ -0,0 +1,72 @@
+import { Dispatch, SetStateAction, createContext } from "react";
+import { Connection, EdgeType, NodeType, addEdge } from "@xyflow/react";
+
+type Pos = {x: int, y: int,};
+
+export interface Iface {
+  add(type: string, pos: Pos, data: any): string;
+  remove(id: string[]): void;
+  modify(id: string, data: any): void;
+
+  connect(conn: Connection): void;
+  disconnect(conn: Connection[]): void;
+};
+
+export const Editor = createContext<Iface|undefined>(undefined);
+export default Editor;
+
+type SetNodes = Dispatch<SetStateAction<NodeType[]>>;
+type SetEdges = Dispatch<SetStateAction<EdgeType[]>>;
+export class Impl implements Iface {
+  _setNodes: SetNodes;
+  _setEdges: SetEdges;
+  _nextId: number = 0;
+
+  constructor(setNodes: SetNodes, setEdges: SetEdges, nextId: number = 0) {
+    this._setNodes = setNodes;
+    this._setEdges = setEdges;
+    this._nextId   = nextId;
+  }
+
+  add(type: string, pos: Pos, data: any): string {
+    const ret = this._genNextId();
+    this._setNodes((nds)=>[...nds, {
+      id: ret,
+      type: type,
+      pos: pos,
+      data: data,
+    }]);
+    return ret;
+  }
+  remove(ids: string[]): void {
+    this._setNodes((nds)=>nds.filter((x)=>!ids.includes(x.id)));
+  }
+  modify(id: string, data: any): void {
+    this._setNodes(
+      (nds)=>nds.map((n)=>n.id === id? {...n, data: data}: n)
+    );
+  }
+
+  connect(c: Connection): void {
+    this._setEdges((eds)=>addEdge({
+      ...c,
+      deletable: true,
+    }, eds));
+  }
+  disconnect(cs: Connection[]): void {
+    this._setEdges((eds)=>eds.filter((e)=>!cs.some(c=>matchEdgeAndConn(e, c))));
+  }
+
+  _genNextId(): number {
+    return "n"+(_nextId++);
+  }
+};
+
+function matchEdgeAndConn(e: Edge, c: Connection) {
+  return (
+    (e.source === c.source) &&
+      ((e.sourceHandle??null) == (c.sourceHandle??null)) &&
+      (e.target == c.target) &&
+      ((e.targetHandle??null) == (c.targetHandle??null))
+  );
+}
diff --git a/src/pages/context/History.tsx b/src/pages/context/History.tsx
deleted file mode 100644
index 6674ccb..0000000
--- a/src/pages/context/History.tsx
+++ /dev/null
@@ -1,22 +0,0 @@
-import { Dispatch, SetStateAction, createContext } from "react";
-import { Node, } from "@xyflow/react";
-
-export interface Iface {
-  push(id: string, data: any): void,
-};
-
-export const History = createContext<Iface|undefined>(undefined);
-export default History;
-
-export class Impl implements Iface {
-  setNodes: Dispatch<SetStateAction<Node[]>>;
-
-  constructor(setNodes: Dispatch<SetStateAction<Node[]>>) {
-    this.setNodes = setNodes;
-  }
-  push(id: string, data: any): void {
-    this.setNodes(
-      (nds)=>nds.map((n)=>n.id == id? {...n, data: data}: n)
-    );
-  }
-};
diff --git a/src/pages/node/Base.tsx b/src/pages/node/Base.tsx
index a2a89ba..0489488 100644
--- a/src/pages/node/Base.tsx
+++ b/src/pages/node/Base.tsx
@@ -1,14 +1,39 @@
-import { ReactNode } from "react";
+import { useTranslation } from "react-i18next";
+import { ReactNode, useContext, useCallback } from "react";
+import { NodeProps } from "@xyflow/react";
+
+import style from "./style.module.scss";
+
+import Editor from "../context/Editor";
 
 type Params = {
   title: ReactNode,
   children: ReactNode,
+  node: NodeProps,
 };
 export default function Base(p: Params) {
+  const {t} = useTranslation();
+
+  const editor = useContext(Editor);
+  if (editor === undefined) {
+    throw new Error("no editor context");
+  }
+
+  const onDelete = useCallback(()=>editor.remove([p.node.id]), [p.node]);
+
   return (
-    <div>
-      <div>{p.title}</div>
-      {p.children}
+    <div className={style.node}>
+      <div className={style.header}>
+        <div className={style.title}>{p.title}</div>
+        <div className={style.buttons}>
+          <button onClick={onDelete} disabled={!p.node.deletable}>
+            {t("pages.screening.nodes.base.remove")}
+          </button>
+        </div>
+      </div>
+      <div className={style.body}>
+        {p.children}
+      </div>
     </div>
   );
 }
diff --git a/src/pages/node/fetch.tsx b/src/pages/node/fetch.tsx
index a501768..50ba131 100644
--- a/src/pages/node/fetch.tsx
+++ b/src/pages/node/fetch.tsx
@@ -3,30 +3,35 @@ import { useTranslation } from "react-i18next";
 import { Handle, Node, NodeProps, Position } from "@xyflow/react";
 import Base from "./Base";
 
-import History from "../context/History";
+import Editor from "../context/Editor";
 
 export type ToshoListed = Node<{
   prime: boolean,
   standard: boolean,
   growth: boolean,
 }, "fetch_ToshoListed">;
-export function ToshoListed({id, data}: NodeProps<ToshoListed>) {
+export function ToshoListed(node: NodeProps<ToshoListed>) {
+  const {id, data} = node;
+
   const {t} = useTranslation();
 
-  const history = useContext(History);
-  if (history === undefined) {
-    throw new Error("no History context");
+  const editor = useContext(Editor);
+  if (editor === undefined) {
+    throw new Error("no editor context");
   }
 
   return (
-    <Base title={t("pages.screening.nodes.fetch_ToshoListed.title")}>
+    <Base
+      node={node}
+      title={t("pages.screening.nodes.fetch_ToshoListed.title")}
+    >
       <div>
         <div><label>
           <input
             type="checkbox"
             name="prime"
             checked={data.prime}
-            onChange={(e)=>history.push(id, {...data, prime: e.target.checked})}
+            onChange={(e)=>editor.modify(id, {...data, prime: e.target.checked})}
           />
           {t("terms.toshoPrime")}
         </label></div>
@@ -35,7 +40,7 @@ export function ToshoListed({id, data}: NodeProps<ToshoListed>) {
             type="checkbox"
             name="standard"
             checked={data.standard}
-            onChange={(e)=>history.push(id, {...data, standard: e.target.checked})}
+            onChange={(e)=>editor.modify(id, {...data, standard: e.target.checked})}
           />
           {t("terms.toshoStandard")}
         </label></div>
@@ -44,7 +49,7 @@ export function ToshoListed({id, data}: NodeProps<ToshoListed>) {
             type="checkbox"
             name="growth"
             checked={data.growth}
-            onChange={(e)=>history.push(id, {...data, growth: e.target.checked})}
+            onChange={(e)=>editor.modify(id, {...data, growth: e.target.checked})}
           />
           {t("terms.toshoGrowth")}
         </label></div>
diff --git a/src/pages/node/present.tsx b/src/pages/node/present.tsx
index a16ed03..09a49ec 100644
--- a/src/pages/node/present.tsx
+++ b/src/pages/node/present.tsx
@@ -1,11 +1,15 @@
 import { useTranslation } from "react-i18next";
-import { Handle, Position } from "@xyflow/react";
+import { Handle, NodeProps, Position } from "@xyflow/react";
 import Base from "./Base";
 
-export function TableDisplay() {
+export function TableDisplay(node: NodeProps) {
   const {t} = useTranslation();
   return (
-    <Base title={t("pages.screening.nodes.present_TableDisplay.title")}>
+    <Base
+      node={node}
+      title={t("pages.screening.nodes.present_TableDisplay.title")}
+      removable={true}
+    >
       <div>
         <div><a href="#">{t("pages.screening.nodes.present_TableDisplay.open")}</a></div>
       </div>
diff --git a/src/pages/node/style.module.scss b/src/pages/node/style.module.scss
new file mode 100644
index 0000000..856f577
--- /dev/null
+++ b/src/pages/node/style.module.scss
@@ -0,0 +1,21 @@
+.node {
+  background-color: #FFF9E5;
+  border: 1px solid #4A9782;
+  border-radius: 0.5rem;
+  overflow: hidden;
+
+  .header {
+    background-color: #DCD0A8;
+    display: flex;
+    padding: 0 .5rem;
+    gap: 1rem;
+
+    .title {
+    }
+    .buttons {
+    }
+  }
+  .body {
+    padding: .5rem;
+  }
+}