Ojanko High School[]
Activity: Volleyball Club
Class: Year 3, class 2
Birthplace: Chiba Prefecture
Blood Type: O
Ryoko appears as the mahjong challenger representing the volleyball club. Upon defeating her, the player wins a volleyball.
Ryoko defeated.
The name of the school team on Ryoko's jersey, USAGI, is a reference to the rabbit heroes of Rabio Lepus.