Kouichirou Mutou (武藤航一郎) is a main character in Japan Sinks: 2020, voiced in Japanese by Masaki Terasoma. The series' music includes "『日本沈没2020』OP（歌詞入り特別ver. ）｜主題歌：「a life」大貫妙子＆坂本龍一", "kensuke ushio - dad i | Japan Sinks 2020".
