リング先にpartも含めれば、よいと思いますが、方法が、思いつきません。
ご教示の程、よろしくお願いいたします。
\documentclass[a5paper,twocolumn,openany,landscape]{jsbook}
\setlength{\fullwidth}{\textheight}
\special{papersize=148.5mm,210mm}
\usepackage[dvipdfmx]{graphicx}\graphicspath{{./}{./pdf/}}
\usepackage{okumacro}
\usepackage{plext}
\usepackage{otf}
\usepackage[dvipdfmx, pdfdirection=R2L]{hyperref}
\usepackage{pxjahyper}
\def\thechapter{\rensuji{\arabic{chapter}}}
\def\labelchapter{\rensuji{\arabic{chapter}}}
\def\吉{\ajTsuchiYoshi}
\def\prechaptername{}\def\postchaptername{}
\def\prepartname{}\def\postpartname{}
\def\thesection{\rensuji{(\arabic{section})}}
\addtolength{\oddsidemargin}{-10pt}
\addtolength{\evensidemargin}{10pt}
\makeatletter
%\def\contentsline#1#2#3#4{\csname l@#1\endcsname{\hyper@linkstart{link}{#4}{#2}\hyper@linkend}{\rensuji{#3}}}
\def\contentsline#1#2#3#4{\csname l@#1\endcsname{{#2}}{\rensuji{#3}}}
\renewcommand{\thepart}{\rensuji{\@Roman\c@part}}
\def\@makechapterhead#1{%
\vspace*{1.7\Cvs\@plus.7\Cdp \@minus.4\Cdp}% 欧文は50pt
{\parindent \z@ \raggedright \normalfont
\ifnum \c@secnumdepth >\m@ne
\if@mainmatter
\Huge\headfont \@chapapp\thechapter\@chappos
\hskip \Cvs % 欧文は20pt
\fi
\fi
\interlinepenalty\@M
\Huge \headfont #1\par\nobreak
\vskip 2.8\Cvs \@plus.7\Cdp \@minus.4\Cdp}} % 欧文は40pt
\def\@part[#1]#2{%
\ifnum \c@secnumdepth >-2\relax
\refstepcounter{part}%
\addcontentsline{toc}{part}{%
\prepartname\thepart\postpartname\hspace{1zw}#1}%
\else
\addcontentsline{toc}{part}{#1}%
\fi
\markboth{}{}%
{\centering
\interlinepenalty \@M
\normalfont
\ifnum \c@secnumdepth >-2\relax
\Huge\headfont \prepartname\thepart\postpartname
\fi
\Huge \headfont \hskip1zw #2\par}%
\@endpart}
\renewcommand{\section}{%
\if@slide\clearpage\fi
\@startsection{section}{1}{\z@}%
{.8\Cvs \@plus.5\Cdp \@minus.2\Cdp}% 前アキ
{.5\Cvs \@plus.3\Cdp}% 後アキ
{\normalfont\Large\headfont\raggedright\hskip3zw}}
\def\ps@plainhead{%
\let\@mkboth\@gobbletwo
\let\@oddfoot\@empty
\let\@evenfoot\@empty
\def\@evenhead{%
\if@mparswitch \hss \fi
\hbox to \fullwidth{\hfil\textbf{\thepage}}%
\if@mparswitch\else \hss \fi}%
\def\@oddhead{%
\hbox to \fullwidth{\textbf{\thepage}\hfil}\hss}}
\def\ps@headings{%
\let\@oddfoot\@empty
\let\@evenfoot\@empty
\def\@evenhead{%
\if@mparswitch \hss \fi
\underline{\hbox to \fullwidth{\autoxspacing
\leftmark\hfil\textbf{\thepage}}}%
\if@mparswitch\else \hss \fi}%
\def\@oddhead{\underline{\hbox to \fullwidth{\autoxspacing
\textbf{\thepage} \hfil{\if@twoside\rightmark\else\leftmark\fi}}}\hss}%
\let\@mkboth\markboth
}%
\renewcommand{\tableofcontents}{%
\settowidth\jsc@tocl@width{\headfont\prechaptername\postchaptername}%
\settowidth\@tempdima{\headfont\appendixname}%
\ifdim\jsc@tocl@width<\@tempdima \setlength\jsc@tocl@width{\@tempdima}\fi
\ifdim\jsc@tocl@width<2zw \divide\jsc@tocl@width by 2 \advance\jsc@tocl@width 1zw\fi
% \if@twocolumn
% \@restonecoltrue\onecolumn
% \else
% \@restonecolfalse
% \fi
% \chapter*{\contentsname}%
\section*{\contentsname}%
% \@mkboth{\contentsname}{}%
\@starttoc{toc}%
% \if@restonecol\twocolumn\fi
}
\renewcommand*{\l@part}[2]{%
\ifnum \c@tocdepth >-2\relax
\addpenalty{-\@highpenalty}%
% \addvspace{2.25em \@plus\jsc@mpt}%
\addvspace{0.4em \@plus\jsc@mpt}%
\begingroup
\parindent \z@
\rightskip \@tocrmarg
\parfillskip -\rightskip
{\leavevmode
\large \headfont
\setlength\@lnumwidth{4zw}%
#1\hfil \hb@xt@\@pnumwidth{\hss #2}}\par
\nobreak
\global\@nobreaktrue
\everypar{\global\@nobreakfalse\everypar{}}%
\endgroup
\fi}
\renewcommand*{\l@chapter}[2]{%
\ifnum \c@tocdepth >\m@ne
\addpenalty{-\@highpenalty}%
% \addvspace{1.0em \@plus\jsc@mpt}
\addvspace{0.25em \@plus\jsc@mpt}
\begingroup
\parindent\z@
\rightskip\@tocrmarg
\parfillskip-\rightskip
\leavevmode\headfont
% \setlength\@lnumwidth{\jsc@tocl@width}\advance\@lnumwidth 2.683zw
\setlength\@lnumwidth{\jsc@tocl@width}\advance\@lnumwidth 0.683zw
\advance\leftskip\@lnumwidth \hskip-\leftskip
#1\nobreak\hfil\nobreak\hbox to\@pnumwidth{\hss#2}\par
\penalty\@highpenalty
\endgroup
\fi}
\renewcommand*{\l@section}{%
\@tempdima\jsc@tocl@width \advance\@tempdima -1zw
\@dottedtocline{1}{\@tempdima}{3.683zw}
}
\makeatother
\def\Ingra#1#2{\includegraphics[scale=#1]{#2}}
\def\Ingrah#1#2{\includegraphics[width=#1]{#2}}
\def\Ingraw#1#2{\includegraphics[height=#1]{#2}}
\def\labelenumi{\rensuji{\arabic{enumi}}}
\def\＝{\kern1.5pt＝\kern-3pt＝\kern1.5pt}
\def\rensuji#1{\hskip\kanjiskip\hbox to 1zw{\yoko\hss\smash{#1}\hss\rule[-0.12zw]{0zw}{1zw}}\hskip\kanjiskip}
\title{\vskip20pt\Huge ＊＊＊＊＊＊%}\author{
\hskip100pt\Large ＊＊＊＊}
\author{}
\date{}
\pagestyle{headings}
\begin{document}\tate
\maketitle
\frontmatter
\thispagestyle{empty}%
\begin{figure*}
\includegraphics[scale=.898,angle=90]{photo0001}
\end{figure*}\clearpage
\thispagestyle{empty}%
\setcounter{tocdepth}{0}%
\tableofcontents
\mainmatter
\input{prologue}
\part{結婚するまで}
\input{chapter01}\input{chapter02}\input{chapter03}\input{chapter04}\input{chapter05}
\input{chapter06}\input{chapter07}\input{chapter08}\input{chapter09}\input{chapter10}
\input{chapter11}\input{chapter12}\input{chapter13}\input{chapter14}\input{chapter15}
\part{結婚してから}\setcounter{chapter}{0}
\input{chap2-01}\input{chap2-02}\input{chap2-03}\input{chap2-04}\input{chap2-05}
\input{chap2-06}\input{chap2-07}\input{chap2-08}\input{chap2-09}\input{chap2-10}
\input{chap2-11}\input{chap2-12}
\chapter*{エピローグ}\addcontentsline{toc}{part}{エピローグ}
\end{document}