%% from review-pdfmaker
\usepackage{fancyhdr}
\pagestyle{fancy}
\lhead{\gtfamily\sffamily\bfseries\upshape \leftmark}
\chead{}
\rhead{\gtfamily\sffamily\bfseries\upshape \rightmark}
\renewcommand{\sectionmark}[1]{\markright{\thesection~#1}{}}
\renewcommand{\chaptermark}[1]{\markboth{\prechaptername\ \thechapter\ \postchaptername~#1}{}}
\renewcommand{\headfont}{\gtfamily\sffamily\bfseries}

\fancypagestyle{plainhead}{%
\fancyhead{}
\fancyfoot{} % clear all header and footer fields
\fancyfoot[CE,CO]{\thepage}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}}

%%Helveticaを使う
\renewcommand{\sfdefault}{phv}

\sloppy