Manabu Yukawa (played by Masaharu Fukuyama) is a protagonist in Galileo.
Kusanagi Shunpei (played by Kazuki Kitamura) appears in Galileo.
Minoru Otagawa (played by Yu Sawabe) appears in Galileo.
Hiromi Kuribayashi (played by Ikkei Watanabe) appears in Galileo.
Across two seasons, Manabu Yukawa investigates deaths and threats that appear supernatural or impossible. The overarching structure repeatedly moves from extraordinary claims to scientific examination, while the later cases make Yukawa himself the target of an intellectual challenge.