Ryoko Kawashigi (柏木凌子 Kashiwagi Ryōko) is a flight attendant in Japan.
Ryoko met Shinichi Okazaki after he ran away from home and began working as his pimp, introducing him to alcohol and drugs.
She lives in the same apartment complex as Shin's family, where he would trick his assistant into driving him to see her.
Later on both herself and Shin get arrested for marijuana possession causing Blast to withdraw from their tour.
- The name Ryoko means "surpass, excel" (凌) (ryou) and "child" (子) (ko).
- Ryoko's surname Kashiwagi means "Japanese emperor oak".
- The kanji Kashiwa specifically refers the Japanese Emperor Oak/Daimyo oak (Quercus dentata).