diff --git a/function/function.php b/function/function.php
index e75b1d4..9759b3c 100644
--- a/function/function.php
+++ b/function/function.php
@@ -2374,12 +2374,31 @@ function getFolloweeList($pdo, $userid){
         $all_followee = $query->fetchAll(PDO::FETCH_COLUMN);
 
         if($all_followee){
-            return $all_followee;
+            $valid_followees = [];
+            foreach ($all_followee as $followee_id){
+                $userData = getUserData($pdo, $followee_id);
+                if($userData){ 
+                    $valid_followees[] = $followee_id;
+                } else {
+                    unfollow_user($pdo, $followee_id, $userid);
+                }
+            }
+            return $valid_followees;
         }else{
             $userdata = getUserData($pdo, $userid);
             $followeeIds = array_filter(explode(',', $userdata['follow']));
             if($followeeIds){
-                return $followeeIds;
+                $valid_followees = [];
+                foreach ($followeeIds as $followee_id){
+                    $userData = getUserData($pdo, $followee_id);
+
+                    if($userData){
+                        $valid_followees[] = $followee_id;
+                    } else {
+                        unfollow_user($pdo, $followee_id, $userid);
+                    }
+                }
+                return $valid_followees;
             }else{
                 return array();
             }
@@ -2396,12 +2415,32 @@ function getFollowerList($pdo, $userid){
         $all_follower = $query->fetchAll(PDO::FETCH_COLUMN);
 
         if($all_follower){
-            return $all_follower;
+            $valid_followers = [];
+            foreach ($all_follower as $follower_id){
+                $userData = getUserData($pdo, $follower_id);
+
+                if($userData){
+                    $valid_followers[] = $follower_id;
+                } else {
+                    unfollow_user($pdo, $userid, $follower_id);
+                }
+            }
+            return $valid_followers;
         }else{
             $userdata = getUserData($pdo, $userid);
             $followerIds = array_filter(explode(',', $userdata['follower']));
             if($followerIds){
-                return $followerIds;
+                $valid_followers = [];
+                foreach ($followerIds as $follower_id){
+                    $userData = getUserData($pdo, $follower_id);
+
+                    if($userData){
+                        $valid_followers[] = $follower_id;
+                    } else {
+                        unfollow_user($pdo, $userid, $follower_id);
+                    }
+                }
+                return $valid_followers;
             }else{
                 return array();
             }
@@ -2672,19 +2711,11 @@ function deleteUser($pdo, $userid, $step, $job_uniqid){
 
         if($step == "delete_follow"){
             if(changeJob($pdo, $userid, $job_uniqid, "delete_follow", "running")){
-                // フォロー・フォロワー情報を削除したい全てのアカウントを取得
-                    $flw_query = $pdo->prepare("SELECT * 
-                    FROM account 
-                    WHERE FIND_IN_SET(:userid, follow) > 0
-                    OR FIND_IN_SET(:userid, follower) > 0;
-                "); 				
-                $flw_query->bindValue(':userid', $userid, PDO::PARAM_STR);
-                $flw_query->execute();
-                $flw_accounts = $flw_query->fetchAll();
+                $flw_accounts = array_merge(getFolloweeList($pdo, $userid),getFollowerList($pdo, $userid));
 
                 foreach ($flw_accounts as $account) {
-                    unfollow_user($pdo, $account['userid'], $userid);
-                    unfollow_user($pdo, $userid, $account['userid']);
+                    unfollow_user($pdo, $account, $userid);
+                    unfollow_user($pdo, $userid, $account);
                 }
 
                 // ユーザーIDを削除したい全てのアカウントを取得
@@ -3585,39 +3616,44 @@ function val_AddOtherSettings($dataname, $data, $jsontext){
 }
 //ユーザーのOther_Settingsが既にあるかないか(なければ空のJSONを追加)
 function is_OtherSettings($pdo, $userid, $add = true){
-    $other_settings = getUserData($pdo, $userid)["other_settings"];
-    if(empty($other_settings)){
-        if($add === true){
-            $new_data = [];
-            $new_json = json_encode($new_data);
+    $other_settings = getUserData($pdo, $userid);
+    if($other_settings){
+        if(empty($other_settings["other_settings"])){
+            if($add === true){
+                $new_data = [];
+                $new_json = json_encode($new_data);
 
-            $pdo->beginTransaction();
-            try {
-                // UPDATE文を実行してフォロー情報を更新
-                $updateQuery = $pdo->prepare("UPDATE account SET other_settings = :other_settings WHERE userid = :userid");
-                $updateQuery->bindValue(':other_settings', $new_json, PDO::PARAM_STR);
-                $updateQuery->bindValue(':userid', $userid, PDO::PARAM_STR);
-                $res = $updateQuery->execute();
+                $pdo->beginTransaction();
+                try {
+                    // UPDATE文を実行してフォロー情報を更新
+                    $updateQuery = $pdo->prepare("UPDATE account SET other_settings = :other_settings WHERE userid = :userid");
+                    $updateQuery->bindValue(':other_settings', $new_json, PDO::PARAM_STR);
+                    $updateQuery->bindValue(':userid', $userid, PDO::PARAM_STR);
+                    $res = $updateQuery->execute();
 
-                if($res){
-                    $pdo->commit();
-                    return true;
-                }else{
+                    if($res){
+                        $pdo->commit();
+                        return true;
+                    }else{
+                        // ロールバック
+                        $pdo->rollBack();
+                        actionLog($userid, "error", "is_OtherSettings", null, "空のOtherSettingsを追加できませんでした", 3);
+                        return false;
+                    }
+                } catch (Exception $e) {
                     // ロールバック
                     $pdo->rollBack();
-                    actionLog($userid, "error", "is_OtherSettings", null, "空のOtherSettingsを追加できませんでした", 3);
+                    actionLog($userid, "error", "is_OtherSettings", null, $e, 4);
                     return false;
                 }
-            } catch (Exception $e) {
-                // ロールバック
-                $pdo->rollBack();
-                actionLog($userid, "error", "is_OtherSettings", null, $e, 4);
+            }else{
                 return false;
             }
         }else{
-            return false;
+            return true;
         }
     }else{
+        //unfollow_userの救済だーー！！！
         return true;
     }
 }
diff --git a/passrecovery/badrecovery.php b/passrecovery/badrecovery.php
index 953809e..8fcc98c 100644
--- a/passrecovery/badrecovery.php
+++ b/passrecovery/badrecovery.php
@@ -1,4 +1,15 @@
 <?php 
+session_name('uwuzu_s_id');
+session_set_cookie_params([
+    'lifetime' => 0,
+    'path' => '/',
+    'domain' => '',
+    'secure' => true,
+    'httponly' => true,
+    'samesite' => 'Lax'
+]);
+session_start();
+
 require('../db.php');
 require("../function/function.php");
 
diff --git a/passrecovery/donerecovery.php b/passrecovery/donerecovery.php
index b0ab676..353ed22 100644
--- a/passrecovery/donerecovery.php
+++ b/passrecovery/donerecovery.php
@@ -1,4 +1,15 @@
 <?php 
+session_name('uwuzu_s_id');
+session_set_cookie_params([
+    'lifetime' => 0,
+    'path' => '/',
+    'domain' => '',
+    'secure' => true,
+    'httponly' => true,
+    'samesite' => 'Lax'
+]);
+session_start();
+
 require('../db.php');
 require("../function/function.php");
 
diff --git a/server/uwuzuinfo.txt b/server/uwuzuinfo.txt
index 3f641a2..24319fd 100644
--- a/server/uwuzuinfo.txt
+++ b/server/uwuzuinfo.txt
@@ -1,4 +1,4 @@
 uwuzu
-1.6.5
-2025/10/27
+1.6.6
+2025/11/08
 daichimarukana,putonfps
\ No newline at end of file
diff --git a/server/uwuzurelease.txt b/server/uwuzurelease.txt
index a66cb48..6f89d47 100644
--- a/server/uwuzurelease.txt
+++ b/server/uwuzurelease.txt
@@ -1,6 +1,12 @@
 ## リリースノートだぜぇぇぇぇぇぇい！！！！！！！
 ここにはuwuzuの更新情報を載せてくぜぇ～！(いやまてテンションおかしいだろ...)
 
+## Version 1.6.6 (Hapuego)
+2025/11/08
+fix: アカウント削除時にフォロー情報が削除されない問題を修正しました！
+fix: パスワードの回復機能にあるちっちゃいバグを修正しました！
+chg: ユーザープロフィールページをちょっと高速化しました！
+
 ## Version 1.6.5 (Hapuego)
 2025/10/27
 fix: ユーズに返信をするページにて、選択しているユーズがどれかを表示する点が表示されない問題を修正しました！
@@ -42,6 +48,7 @@ new: ブルートフォースアタックからアカウントを保護するた
     - last_attack_datetime:指定なし:最終ログイン失敗日時
     - blocked_until_datetime:指定なし:ブロック終了日時
     - datetime(datetime):指定なし:最初の失敗ログイン記録日時
+uwuzu_database.sqlは更新済みです。
 
 ## Version 1.6.4 (Hapuego)
 2025/08/20
diff --git a/update.json b/update.json
index 5d59ebc..4a39ba3 100644
--- a/update.json
+++ b/update.json
@@ -1,71 +1,16 @@
 {
     "software": "uwuzu",
-    "version": "1.6.5",
-    "release_date": "2025/10/27",
-    "release_notes": "このアップデートでは、ログインに関する重大な脆弱性及びフォローの仕組みの改修、その他様々なバグの修正が含まれます。\n早急なアップデートを強く推奨します！！！！！\nなお、このアップデートでは事前にDB構造の更新が必要です。\n詳細はリリースノートをご確認ください。",
+    "version": "1.6.6",
+    "release_date": "2025/11/08",
+    "release_notes": "このアップデートでは、フォローに関するバグの修正などが含まれます。\n詳細はリリースノートをご確認ください。",
     "notices": "アップデート前にデータのバックアップを行うことをおすすめします！",
     "files": {
         "overwrite": [
             "/function/function.php",
-            "/ueuse/index.php",
-            "/admin/addadmin.php",
-            "/admin/index.php",
-            "/api/auth.php",
-            "/api/me/index.php",
-            "/api/ueuse/replies.php",
-            "/api/users/index.php",
-            "/api/users/unfollow.php",
-            "/bookmark/index.php",
-            "/emoji/index.php",
-            "/home/index.php",
-            "/js/view_function.js",
-            "/migration/index.php",
-            "/new.php",
-            "/addauthcode.php",
-            "/authcodechk.php",
-            "/authlogin.php",
-            "/check.php",
-            "/login.php",
-            "/success.php",
-            "/uwuzu_error_code.txt",
-            "/css/home.css",
-            "/abi/addabi.php",
-            "/nextpage/bookmarktimeline.php",
-            "/nextpage/followtimeline.php",
-            "/nextpage/foryoutimeline.php",
-            "/nextpage/localtimeline.php",
-            "/nextpage/searchtimeline.php",
-            "/nextpage/ueusetimeline.php",
-            "/notice/addnotice.php",
-            "/notice/index.php",
-            "/notification/index.php",
-            "/others/account_migration.php",
-            "/others/account_migration_done.php",
-            "/others/index.php",
-            "/others/token.php",
-            "/search/index.php",
-            "/settings/addauthcode.php",
-            "/settings/index.php",
-            "/settings/success.php",
-            "/settings_admin/actionlog_admin.php",
-            "/settings_admin/ad_admin.php",
-            "/settings_admin/addemoji_admin.php",
-            "/settings_admin/codeadmin.php",
-            "/settings_admin/customize_admin.php",
-            "/settings_admin/ipblock_admin.php",
-            "/settings_admin/jobs_admin.php",
-            "/settings_admin/maintenance_admin.php",
-            "/settings_admin/moderation_admin.php",
-            "/settings_admin/overview_admin.php",
-            "/settings_admin/plugin_admin.php",
-            "/settings_admin/role_admin.php",
-            "/settings_admin/serveradmin.php",
-            "/settings_admin/update_admin.php",
-            "/settings_admin/useradmin.php",
-            "/settings_admin/userinfo.php",
+            "/passrecovery/badrecovery.php",
+            "/passrecovery/donerecovery.php",
             "/user/index.php",
-            "/user/report.php",
-            "/user/success.php",
+            "/server/uwuzuabout.txt",
             "/server/uwuzuinfo.txt",
             "/server/uwuzurelease.txt"
         ],
diff --git a/user/index.php b/user/index.php
index 70cb8b2..afcf753 100644
--- a/user/index.php
+++ b/user/index.php
@@ -155,35 +155,27 @@ if (!empty($pdo)) {
 			$ueuse_cnt = $allueuse->rowCount();
 
 			//-------フォロワー取得---------
-
 			$follower_userdata = array();
-			if(!(empty($follower))){
-				foreach ($follower as $follower_userid) {
-					$follower_userQuery = $pdo->prepare("SELECT username, userid, iconname, headname, sacinfo FROM account WHERE userid = :userid");
-					$follower_userQuery->bindValue(':userid', $follower_userid);
-					$follower_userQuery->execute();
-					$follower_userinfo = $follower_userQuery->fetch();
 
-					if ($follower_userinfo) {
-						$follower_userdata[] = $follower_userinfo;
-					}
-				}
+			if ($follower != false) {
+				$placeholders_follower = str_repeat('?,', count($follower) - 1) . '?';
+				$get_follower_sql = "SELECT username, userid, iconname, headname, sacinfo FROM account WHERE userid IN ($placeholders_follower)";
+				$follower_userQuery = $pdo->prepare($get_follower_sql);
+				$follower_userQuery->execute($follower);
+
+				$follower_userdata = $follower_userQuery->fetchAll(PDO::FETCH_ASSOC);
 			}
 
 			//-------フォロー取得---------
-
 			$follow_userdata = array();
-			if(!(empty($follow))){
-				foreach ($follow as $follow_userid) {
-					$follow_userQuery = $pdo->prepare("SELECT username, userid, iconname, headname, sacinfo FROM account WHERE userid = :userid");
-					$follow_userQuery->bindValue(':userid', $follow_userid);
-					$follow_userQuery->execute();
-					$follow_userinfo = $follow_userQuery->fetch();
 
-					if ($follow_userinfo) {
-						$follow_userdata[] = $follow_userinfo;
-					}
-				}
+			if ($follow != false) {
+				$placeholders_follow = str_repeat('?,', count($follow) - 1) . '?';
+				$get_follow_sql = "SELECT username, userid, iconname, headname, sacinfo FROM account WHERE userid IN ($placeholders_follow)";
+				$follow_userQuery = $pdo->prepare($get_follow_sql);
+				$follow_userQuery->execute($follow);
+
+				$follow_userdata = $follow_userQuery->fetchAll(PDO::FETCH_ASSOC);
 			}
 
 			if(filter_var($userdata['iconname'], FILTER_VALIDATE_URL)){