diff --git a/packages/backend/src/core/DriveService.ts b/packages/backend/src/core/DriveService.ts
index 3f38cf4a22..9b6187be4f 100644
--- a/packages/backend/src/core/DriveService.ts
+++ b/packages/backend/src/core/DriveService.ts
@@ -461,36 +461,12 @@ export class DriveService {
 		requestHeaders = null,
 		ext = null,
 	}: AddFileArgs): Promise<MiDriveFile> {
-		let skipNsfwCheck = false;
 		const instance = await this.metaService.fetch();
 		const userRoleNSFW = user && (await this.roleService.getUserPolicies(user.id)).alwaysMarkNsfw;
-		if (user == null) {
-			skipNsfwCheck = true;
-		} else if (userRoleNSFW) {
-			skipNsfwCheck = true;
-		}
-		if (instance.sensitiveMediaDetection === 'none') skipNsfwCheck = true;
-		if (user && instance.sensitiveMediaDetection === 'local' && this.userEntityService.isRemoteUser(user)) skipNsfwCheck = true;
-		if (user && instance.sensitiveMediaDetection === 'remote' && this.userEntityService.isLocalUser(user)) skipNsfwCheck = true;
 
-		const info = await this.fileInfoService.getFileInfo(path, {
-			skipSensitiveDetection: skipNsfwCheck,
-			sensitiveThreshold: // 感度が高いほどしきい値は低くすることになる
-			instance.sensitiveMediaDetectionSensitivity === 'veryHigh' ? 0.1 :
-			instance.sensitiveMediaDetectionSensitivity === 'high' ? 0.3 :
-			instance.sensitiveMediaDetectionSensitivity === 'low' ? 0.7 :
-			instance.sensitiveMediaDetectionSensitivity === 'veryLow' ? 0.9 :
-			0.5,
-			sensitiveThresholdForPorn: 0.75,
-			enableSensitiveMediaDetectionForVideos: instance.enableSensitiveMediaDetectionForVideos,
-		});
+		const info = await this.fileInfoService.getFileInfo(path);
 		this.registerLogger.info(`${JSON.stringify(info)}`);
 
-		// 現状 false positive が多すぎて実用に耐えない
-		//if (info.porn && instance.disallowUploadWhenPredictedAsPorn) {
-		//	throw new IdentifiableError('282f77bf-5816-4f72-9264-aa14d8261a21', 'Detected as porn.');
-		//}
-
 		// detect name
 		const detectedName = correctFilename(
 			// DriveFile.nameは256文字, validateFileNameは200文字制限であるため、
@@ -586,7 +562,6 @@ export class DriveService {
 			: false;
 
 		if (info.sensitive && profile!.autoSensitive) file.isSensitive = true;
-		if (info.sensitive && instance.setSensitiveFlagAutomatically) file.isSensitive = true;
 		if (userRoleNSFW) file.isSensitive = true;
 
 		if (url !== null) {
diff --git a/packages/backend/src/core/FileInfoService.ts b/packages/backend/src/core/FileInfoService.ts
index 25487fa0fa..803f6908de 100644
--- a/packages/backend/src/core/FileInfoService.ts
+++ b/packages/backend/src/core/FileInfoService.ts
@@ -50,13 +50,7 @@ export class FileInfoService {
 	 * Get file information
 	 */
 	@bindThis
-	// eslint-disable-next-line @typescript-eslint/no-unused-vars
-	public async getFileInfo(path: string, _opts: {
-		skipSensitiveDetection: boolean;
-		sensitiveThreshold?: number;
-		sensitiveThresholdForPorn?: number;
-		enableSensitiveMediaDetectionForVideos?: boolean;
-	}): Promise<FileInfo> {
+	public async getFileInfo(path: string): Promise<FileInfo> {
 		const warnings = [] as string[];
 
 		const size = await this.getFileSize(path);
diff --git a/packages/backend/src/server/api/endpoints/admin/update-meta.ts b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
index 915021601a..efb6695d35 100644
--- a/packages/backend/src/server/api/endpoints/admin/update-meta.ts
+++ b/packages/backend/src/server/api/endpoints/admin/update-meta.ts
@@ -292,22 +292,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				set.turnstileSecretKey = ps.turnstileSecretKey;
 			}
 
-			if (ps.sensitiveMediaDetection !== undefined) {
-				set.sensitiveMediaDetection = ps.sensitiveMediaDetection;
-			}
-
-			if (ps.sensitiveMediaDetectionSensitivity !== undefined) {
-				set.sensitiveMediaDetectionSensitivity = ps.sensitiveMediaDetectionSensitivity;
-			}
-
-			if (ps.setSensitiveFlagAutomatically !== undefined) {
-				set.setSensitiveFlagAutomatically = ps.setSensitiveFlagAutomatically;
-			}
-
-			if (ps.enableSensitiveMediaDetectionForVideos !== undefined) {
-				set.enableSensitiveMediaDetectionForVideos = ps.enableSensitiveMediaDetectionForVideos;
-			}
-
 			if (ps.enableBotTrending !== undefined) {
 				set.enableBotTrending = ps.enableBotTrending;
 			}
diff --git a/packages/frontend/src/pages/admin/security.vue b/packages/frontend/src/pages/admin/security.vue
index 1ff38548c9..f02fa1024d 100644
--- a/packages/frontend/src/pages/admin/security.vue
+++ b/packages/frontend/src/pages/admin/security.vue
@@ -20,49 +20,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<XBotProtection/>
 				</MkFolder>
 
-				<MkFolder>
-					<template #icon><i class="ph-eye-slash ph-bold ph-lg"></i></template>
-					<template #label>{{ i18n.ts.sensitiveMediaDetection }}</template>
-					<template v-if="sensitiveMediaDetection === 'all'" #suffix>{{ i18n.ts.all }}</template>
-					<template v-else-if="sensitiveMediaDetection === 'local'" #suffix>{{ i18n.ts.localOnly }}</template>
-					<template v-else-if="sensitiveMediaDetection === 'remote'" #suffix>{{ i18n.ts.remoteOnly }}</template>
-					<template v-else #suffix>{{ i18n.ts.none }}</template>
-
-					<div class="_gaps_m">
-						<span>{{ i18n.ts._sensitiveMediaDetection.description }}</span>
-
-						<MkRadios v-model="sensitiveMediaDetection">
-							<option value="none">{{ i18n.ts.none }}</option>
-							<option value="all">{{ i18n.ts.all }}</option>
-							<option value="local">{{ i18n.ts.localOnly }}</option>
-							<option value="remote">{{ i18n.ts.remoteOnly }}</option>
-						</MkRadios>
-
-						<MkRange v-model="sensitiveMediaDetectionSensitivity" :min="0" :max="4" :step="1" :textConverter="(v) => `${v + 1}`">
-							<template #label>{{ i18n.ts._sensitiveMediaDetection.sensitivity }}</template>
-							<template #caption>{{ i18n.ts._sensitiveMediaDetection.sensitivityDescription }}</template>
-						</MkRange>
-
-						<MkSwitch v-model="enableSensitiveMediaDetectionForVideos">
-							<template #label>{{ i18n.ts._sensitiveMediaDetection.analyzeVideos }}<span class="_beta">{{ i18n.ts.beta }}</span></template>
-							<template #caption>{{ i18n.ts._sensitiveMediaDetection.analyzeVideosDescription }}</template>
-						</MkSwitch>
-
-						<MkSwitch v-model="setSensitiveFlagAutomatically">
-							<template #label>{{ i18n.ts._sensitiveMediaDetection.setSensitiveFlagAutomatically }} ({{ i18n.ts.notRecommended }})</template>
-							<template #caption>{{ i18n.ts._sensitiveMediaDetection.setSensitiveFlagAutomaticallyDescription }}</template>
-						</MkSwitch>
-
-						<!-- 現状 false positive が多すぎて実用に耐えない
-						<MkSwitch v-model="disallowUploadWhenPredictedAsPorn">
-							<template #label>{{ i18n.ts._sensitiveMediaDetection.disallowUploadWhenPredictedAsPorn }}</template>
-						</MkSwitch>
-						-->
-
-						<MkButton primary @click="save"><i class="ph-floppy-disk ph-bold ph-lg"></i> {{ i18n.ts.save }}</MkButton>
-					</div>
-				</MkFolder>
-
 				<MkFolder>
 					<template #label>Active Email Validation</template>
 					<template v-if="enableActiveEmailValidation" #suffix>Enabled</template>
@@ -126,10 +83,6 @@ let summalyProxy: string = $ref('');
 let enableHcaptcha: boolean = $ref(false);
 let enableRecaptcha: boolean = $ref(false);
 let enableTurnstile: boolean = $ref(false);
-let sensitiveMediaDetection: string = $ref('none');
-let sensitiveMediaDetectionSensitivity: number = $ref(0);
-let setSensitiveFlagAutomatically: boolean = $ref(false);
-let enableSensitiveMediaDetectionForVideos: boolean = $ref(false);
 let enableIpLogging: boolean = $ref(false);
 let enableActiveEmailValidation: boolean = $ref(false);
 
@@ -139,15 +92,6 @@ async function init() {
 	enableHcaptcha = meta.enableHcaptcha;
 	enableRecaptcha = meta.enableRecaptcha;
 	enableTurnstile = meta.enableTurnstile;
-	sensitiveMediaDetection = meta.sensitiveMediaDetection;
-	sensitiveMediaDetectionSensitivity =
-		meta.sensitiveMediaDetectionSensitivity === 'veryLow' ? 0 :
-		meta.sensitiveMediaDetectionSensitivity === 'low' ? 1 :
-		meta.sensitiveMediaDetectionSensitivity === 'medium' ? 2 :
-		meta.sensitiveMediaDetectionSensitivity === 'high' ? 3 :
-		meta.sensitiveMediaDetectionSensitivity === 'veryHigh' ? 4 : 0;
-	setSensitiveFlagAutomatically = meta.setSensitiveFlagAutomatically;
-	enableSensitiveMediaDetectionForVideos = meta.enableSensitiveMediaDetectionForVideos;
 	enableIpLogging = meta.enableIpLogging;
 	enableActiveEmailValidation = meta.enableActiveEmailValidation;
 }
@@ -155,16 +99,6 @@ async function init() {
 function save() {
 	os.apiWithDialog('admin/update-meta', {
 		summalyProxy,
-		sensitiveMediaDetection,
-		sensitiveMediaDetectionSensitivity:
-			sensitiveMediaDetectionSensitivity === 0 ? 'veryLow' :
-			sensitiveMediaDetectionSensitivity === 1 ? 'low' :
-			sensitiveMediaDetectionSensitivity === 2 ? 'medium' :
-			sensitiveMediaDetectionSensitivity === 3 ? 'high' :
-			sensitiveMediaDetectionSensitivity === 4 ? 'veryHigh' :
-			0,
-		setSensitiveFlagAutomatically,
-		enableSensitiveMediaDetectionForVideos,
 		enableIpLogging,
 		enableActiveEmailValidation,
 	}).then(() => {