\makeatletter

\def\@opt@{multi}
\def\@default{default}
\def\@jarticle{jarticle}
\def\@tarticle{tarticle}
\def\@op@cls{}

\ifx\option\@undefined
 \def\option{default}
\fi
\ifx\option\@default
\else
 \edef\@opt@{\option,\@opt@}
\fi

\ifx\scale\@undefined
 \edef\scale{default}
\else
 \ifx\scale\@default
 \else
  \edef\@opt@{scale=\scale,\@opt@}
 \fi
\fi
\typeout{## scale: \scale ##}

\ifx\class\@undefined
 \def\class{jarticle}
\fi
\ifx\class\@jarticle
\else
 \ifx\class\@tarticle
 \else
  \ifnum\jis"2121="3000
   \edef\@opt@{uplatex,\@opt@}
   \def\@op@cls{,uplatex}
  \else
  \fi
 \fi
\fi

\documentclass[a4paper,titlepage,draft\@op@cls]{\class}

\usepackage[\@opt@]{otf}
\usepackage{color}
\newcommand{\redframe}[1]{%
 \textcolor{red}{\frame{\textcolor{black}{#1}}}}

\begin{document}
\section{見出し}

クラス：\texttt{\class}\\
オプション：\texttt{\option}\\
スケール：\texttt{\scale}

\parindent0mm
\xkanjiskip=0pt plus.1pt minus.1pt

\vbox{\tate
\hbox{\Large \redframe{HMH}\redframe{回□回}\redframe{HMH}\redframe{回□回}\redframe{HMH}}
\hbox{\Large HMH回□回HMH回□回HMH}
}

\vbox{\yoko
\hbox{\Large \redframe{HMH}\redframe{回□回}\redframe{HMH}\redframe{回□回}\redframe{HMH}}
\hbox{\Large HMH回□回HMH回□回HMH}
}

\end{document}