Haruo Koga (古賀春生) is a supporting character in Japan Sinks: 2020, voiced in Japanese by Hiroyuki Yoshino. 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".
