diff --git a/packages/linejs/base/e2ee/mod.ts b/packages/linejs/base/e2ee/mod.ts
index c0f5426..70c06d7 100644
--- a/packages/linejs/base/e2ee/mod.ts
+++ b/packages/linejs/base/e2ee/mod.ts
@@ -662,6 +662,7 @@ export class E2EE {
 				...messageObj.contentMetadata,
 				...meta,
 			};
+			if (messageObj.chunks) messageObj.chunks = undefined as any;
 		} else if (
 			(messageObj.contentType === "LOCATION" ||
 				messageObj.contentType ===
@@ -671,8 +672,8 @@ export class E2EE {
 			messageObj.location = await this.decryptE2EELocationMessage(
 				messageObj,
 			);
+			if (messageObj.chunks) messageObj.chunks = undefined as any;
 		}
-		if (messageObj.chunks) messageObj.chunks = undefined as any;
 
 		return messageObj;
 	}
diff --git a/packages/linejs/client/features/message/square.ts b/packages/linejs/client/features/message/square.ts
index ead6a46..ce90b70 100644
--- a/packages/linejs/client/features/message/square.ts
+++ b/packages/linejs/client/features/message/square.ts
@@ -13,7 +13,9 @@ import type {
 	StickerMetadata,
 } from "./internal-types.ts";
 import type { DecorationsData, From, MentionTarget, To } from "./types.ts";
+import { InternalError } from "../../../base/core/mod.ts";
 
+const hasContents = ["IMAGE", "VIDEO", "AUDIO", "FILE"];
 export interface SquareMessageInit {
 	client: Client;
 	raw: Message;
@@ -28,6 +30,7 @@ export class SquareMessage {
 
 	readonly isSquare = true;
 	readonly isTalk = false;
+	#authorIsMe?: boolean;
 
 	constructor(init: SquareMessageInit) {
 		this.#client = init.client;
@@ -97,7 +100,9 @@ export class SquareMessage {
 	 */
 	async unsend() {
 		if (!this.isMyMessage) {
-			throw new TypeError("Cannot unsend the message which is not yours.");
+			throw new TypeError(
+				"Cannot unsend the message which is not yours.",
+			);
 		}
 		await this.#client.base.square.unsendMessage({
 			messageId: this.#raw.message.id,
@@ -141,7 +146,8 @@ export class SquareMessage {
 			throw new TypeError("The message is not text message.");
 		}
 		const emojiUrls: string[] = [];
-		const emojiData = this.#raw.message.contentMetadata as unknown as EmojiMeta;
+		const emojiData = this.#raw.message
+			.contentMetadata as unknown as EmojiMeta;
 		const emojiResources = emojiData?.REPLACE?.sticon?.resources ?? [];
 		for (const emoji of emojiResources) {
 			emojiUrls.push(
@@ -303,8 +309,42 @@ export class SquareMessage {
 		};
 	}
 
-	get isMyMessage(): boolean {
-		return this.#client.base.profile?.mid === this.from.id;
+	/**
+	 * @return {Blob} message data
+	 */
+	async getData(preview?: boolean): Promise<Blob> {
+		if (!hasContents.includes(this.#raw.message.contentType as string)) {
+			throw new TypeError(
+				"message have no contents",
+			);
+		}
+		if (this.#raw.message.contentMetadata.DOWNLOAD_URL) {
+			if (preview) {
+				const r = await this.#client.base
+					.fetch(this.#raw.message.contentMetadata.PREVIEW_URL);
+				return await r.blob();
+			} else {
+				const r_1 = await this.#client.base
+					.fetch(this.#raw.message.contentMetadata.DOWNLOAD_URL);
+				return await r_1.blob();
+			}
+		}
+		return this.#client.base.obs.getMessageObsData({
+			messageId: this.#raw.message.id,
+			isPreview: preview,
+			isSquare: true,
+		});
+	}
+
+	public async isMyMessage(): Promise<boolean> {
+		if (typeof this.#authorIsMe === "boolean") {
+			return this.#authorIsMe;
+		}
+		this.#authorIsMe = this.from.id ===
+			(await this.#client.base.square.getSquareChat({
+				squareChatMid: this.to.id,
+			})).squareChatMember.squareMemberMid;
+		return this.#authorIsMe;
 	}
 
 	get to(): To {
diff --git a/packages/linejs/client/features/message/talk.ts b/packages/linejs/client/features/message/talk.ts
index 5bf309d..f48b89f 100644
--- a/packages/linejs/client/features/message/talk.ts
+++ b/packages/linejs/client/features/message/talk.ts
@@ -14,12 +14,15 @@ import type {
 	StickerMetadata,
 } from "./internal-types.ts";
 import type { DecorationsData, From, MentionTarget, To } from "./types.ts";
+import { InternalError } from "../../../base/core/mod.ts";
 
 export interface TalkMessageInit {
 	client: Client;
 	raw: Message;
 }
 
+const hasContents = ["IMAGE", "VIDEO", "AUDIO", "FILE"];
+
 export class TalkMessage {
 	#client: Client;
 	#raw: Message;
@@ -107,7 +110,9 @@ export class TalkMessage {
 	 */
 	async unsend() {
 		if (!this.isMyMessage) {
-			throw new TypeError("Cannot unsend the message which is not yours.");
+			throw new TypeError(
+				"Cannot unsend the message which is not yours.",
+			);
 		}
 		await this.#client.base.talk.unsendMessage({
 			messageId: this.#raw.id,
@@ -247,7 +252,9 @@ export class TalkMessage {
 	 */
 	getSharedContact(): ContactMeta {
 		if (this.#content.type !== "CONTACT") {
-			throw new TypeError("The message does not share contact infomation.");
+			throw new TypeError(
+				"The message does not share contact infomation.",
+			);
 		}
 		const contactData = this.#content.metadata as unknown as ContactMeta;
 		return { mid: contactData.mid, displayName: contactData.displayName };
@@ -313,6 +320,42 @@ export class TalkMessage {
 		};
 	}
 
+	/**
+	 * @return {Blob} message data
+	 */
+	async getData(preview?: boolean): Promise<Blob> {
+		if (!hasContents.includes(this.#content.type as string)) {
+			throw new TypeError(
+				"message have no contents",
+			);
+		}
+		if (this.#raw.contentMetadata.DOWNLOAD_URL) {
+			if (preview) {
+				const r = await this.#client.base
+					.fetch(this.#raw.contentMetadata.PREVIEW_URL);
+				return await r.blob();
+			} else {
+				const r = await this.#client.base
+					.fetch(this.#raw.contentMetadata.DOWNLOAD_URL);
+				return await r.blob();
+			}
+		}
+		if (this.#raw.chunks) {
+			const file = await this.#client.base.obs.downloadMediaByE2EE(
+				this.#raw,
+			);
+			if (!file) {
+				throw new InternalError("ObsError", "Download failed");
+			}
+			return file;
+		} else {
+			return await this.#client.base.obs.getMessageObsData({
+				messageId: this.#raw.id,
+				isPreview: preview,
+				isSquare: false,
+			});
+		}
+	}
 	get isMyMessage(): boolean {
 		return this.#client.base.profile?.mid === this.from.id;
 	}
@@ -347,7 +390,10 @@ export class TalkMessage {
 	): Promise<TalkMessage> {
 		return this.fromRawTalk(source.event.message, client);
 	}
-	static async fromRawTalk(raw: Message, client: Client): Promise<TalkMessage> {
+	static async fromRawTalk(
+		raw: Message,
+		client: Client,
+	): Promise<TalkMessage> {
 		if (raw.contentMetadata.e2eeVersion) {
 			raw = await client.base.e2ee.decryptE2EEMessage(raw);
 		}