Quick answer — Ryouko Oka worked on Baby Steps 2 (Color Design), Tojima Wants to Be a Kamen Rider (Color Design), Baby Steps (Color Design) and 4 more anime.
Ryouko Oka worked on Baby Steps 2 (Color Design), Tojima Wants to Be a Kamen Rider (Color Design), Baby Steps (Color Design), Cells at Work! CODE BLACK (Color Design), ORESUKI: Are you the only one who loves me?: Our Playball / Our End Run / Our Game (Color Design), ORESUKI: Are you the only one who loves me? (Color Design), Armed Girl's Machiavellism (Color Design).
