Ritsuko Okamura

Ritsuko Okamura (岡村 りつ子): Masahiko's big sister and Professor Kōsaka's niece. At first she doesn't trust Amazon due to bringing Geddon to Japan and causing chaos. After being constantly rescued and helped by Amazon she puts her faith and trust in him.

Portrayal
Ritsuko Okamura was portrayed by Mariko Matsuoka (松岡 まりこ).