Riko Shirai
- Born
- 17 December 2001 (24 years)
- Place of birth
- Shimonoseki, Yamaguchi, Japan
- Gender
- Female
Riko Shirai (born December 17, 2001), better known by her ring name Riko Kaiju, is a retired Japanese professional wrestler. She is best known for performing in the Japanese promotion PURE-J where she is a former Princess of Pro-Wrestling Champion. She is also known for her time in SEAdLINNNG.
