\documentclass{article}

\usepackage{fontspec}
\usepackage{xeCJK}
\usepackage{longtable}
\usepackage{parskip}
\usepackage[twoside,paper=$paper$]{geometry}
\usepackage[dvipsnames, table]{xcolor}
\usepackage{mathtools}
\usepackage{multicol}

\setmainfont{Noto Sans}
\setCJKmainfont{Noto Sans CJK JP}

\definecolor{rowColor}{RGB}{149, 184, 230}
\definecolor{headerColor}{gray}{1}
\rowcolors{1}{}{rowColor!30!white}

\setlength{\parindent}{0pt}
\setlength{\parskip}{\baselineskip}

\setlength{\columnsep}{1.5cm}
\setlength{\columnseprule}{0.2pt}

\setcounter{secnumdepth}{0}

\newcommand{\ruby}[2]{$\stackrel{\text{#2}}{\text{#1}}$}

\renewcommand\arraystretch{1.5}
\setlength\extrarowheight{5pt}
\begin{document}

  \thispagestyle{empty}

  \topskip0pt
  \vspace*{\fill}
  \begin{center}
    {
      \fontsize{30pt}{36pt}\normalfont
      よく単語
    }

    \vspace*{1cm}

    March 2023
  \end{center}
  \vspace*{\fill}

\newpage

\begin{multicols}{2}
  \tableofcontents
\end{multicols}

\newpage

% --- %

\end{document}