5 files changed, 18 insertions, 13 deletions
diff --git a/language/japanese/jlreq/README-ja.md b/language/japanese/jlreq/README-ja.md
index 851bcd5d83..d69d75db41 100644
--- a/language/japanese/jlreq/README-ja.md
+++ b/language/japanese/jlreq/README-ja.md
@@ -512,7 +512,10 @@ JFMの名前は次の通りです．`[]`で囲まれている文字は設定に�
     - `xkeyval`パッケージと`ifthen`パッケージの利用をやめた．
     - expl3コードとの親和性を高めた．
     - `\DeclareBlockHeading`に`pagestyle`を追加．
-    - 
+    - バグ修正
+* 2021-07-25
+    - ifthenの読み込みを復活．（Re:VIEWのための一時的なもの．）
+    - バグ修正
 
 
 --------------
diff --git a/language/japanese/jlreq/README.md b/language/japanese/jlreq/README.md
index 86ca8f7660..eef98c2f55 100644
--- a/language/japanese/jlreq/README.md
+++ b/language/japanese/jlreq/README.md
@@ -149,6 +149,9 @@ This package is distributed under the BSD 2-Clause License. See [LICENSE](LICENS
     - It has more compatibility with expl3.
     - Added `pagestyle` to `\DeclareBlockHeading`.
     - Fixed bugs.
+* 2021-07-25
+    - Load `ifthen` again. (Only for Re:VIEW, will be removed in future.)
+    - Fixed bugs.
 
 
 --------------
diff --git a/language/japanese/jlreq/jlreq-ja.pdf b/language/japanese/jlreq/jlreq-ja.pdf
index 5f28ab2f33..453488e1d1 100644
--- a/language/japanese/jlreq/jlreq-ja.pdf
+++ b/language/japanese/jlreq/jlreq-ja.pdf
diff --git a/language/japanese/jlreq/jlreq.cls b/language/japanese/jlreq/jlreq.cls
index 434cd4f5b8..c092b74125 100644
--- a/language/japanese/jlreq/jlreq.cls
+++ b/language/japanese/jlreq/jlreq.cls
@@ -5,8 +5,9 @@
 %%
 % (based on JLReq 20200811 https://www.w3.org/TR/2020/NOTE-jlreq-20200811/)
 \NeedsTeXFormat{LaTeX2e}
-\ProvidesClass{jlreq}[2021/07/22 jlreq]
+\ProvidesClass{jlreq}[2021/07/25 jlreq]
 \RequirePackage{l3keys2e,etoolbox}
+\RequirePackage{ifthen}
 \RequirePackage{jlreq-helpers}
 
 \ExplSyntaxOn
@@ -3930,7 +3931,7 @@
 }
 
 \def\jlreq@pagestyle@parse@position@@#1{%
-  \jlreq@switch{#1}{
+  \str_case_e:nnF { #1 } {
     {top}{\def\jlreq@tempc{#1}}
     {bottom}{\def\jlreq@tempc{#1}}
     {left}{\def\jlreq@tempd{#1}}
@@ -3939,8 +3940,7 @@
     {gutter}{\if@tate\def\jlreq@tempd{right}\else\def\jlreq@tempd{left}\fi}
     {fore_edge}{\if@tate\def\jlreq@tempd{left}\else\def\jlreq@tempd{right}\fi}
     {fore-edge}{\if@tate\def\jlreq@tempd{left}\else\def\jlreq@tempd{right}\fi}
-    {\ClassError{jlreq}{Invalid~position:~#1}{\@ehc}}
-  }%
+  }{\ClassError{jlreq}{Invalid~position:~#1}{\@ehc}}
 }
 
 % レベル#1より低いレベルの見出しの**markを\markboth{}{}にする
@@ -5495,7 +5495,7 @@
         \ifjlreq@parsekeyval@nokey@novalue{%
           \eappto\jlreq@headingsettings{\unexpanded{####1}}%
         }{%
-          \jlreq@switch{####1}{%
+          \str_case_e:nnF {####1} {%
             {heading_type}{%
               \lowercase{\def\jlreq@tempa{####2}}%
               \jlreq@switch{\jlreq@tempa}{
@@ -5508,14 +5508,13 @@
               }%
             }
             {heading_level}{\def\jlreq@level{####2}}
-            {%
-              \tl_if_empty:nTF {#1} { \@firstofone }{%
-                \str_if_eq:nnTF {####1} { restore } {
-                  \csname jlreq@tempa####2\endcsname\@gobble
-                }{\@firstofone}%
-              }%
-              {\eappto\jlreq@headingsettings{\ifx\jlreq@headingsettings\@empty\else ,\fi\unexpanded{####1={####2}}}}%
+          }{%
+            \tl_if_empty:nTF {#1} { \@firstofone }{%
+              \str_if_eq:nnTF {####1} { restore } {
+                \csname jlreq@tempa####2\endcsname\@gobble
+              }{\@firstofone}%
             }%
+            {\eappto\jlreq@headingsettings{\ifx\jlreq@headingsettings\@empty\else ,\fi\unexpanded{####1={####2}}}}%
           }%
         }%
       }{##2}%
diff --git a/language/japanese/jlreq/jlreq.pdf b/language/japanese/jlreq/jlreq.pdf
index a6547be669..12c18fe4bd 100644
--- a/language/japanese/jlreq/jlreq.pdf
+++ b/language/japanese/jlreq/jlreq.pdf