\usepackage{luatexja-ruby,showexpl,booktabs}
\lstset{
preset=\normalsize, basicstyle=\small\ttfamily, basewidth=0.5em,
explpreset={numberstyle=\tiny, numbers=left, numbersep=1em, columns=fixed},
}
\usepackage{luatexja-ruby,showexpl,booktabs}
\lstset{
preset=\normalsize, basicstyle=\small\ttfamily, basewidth=0.5em,
explpreset={numberstyle=\tiny, numbers=left, numbersep=1em, columns=fixed},
}