Actress Chise Nakamura who had played Natsuki Mamiya / Bouken Yellow in GoGo Sentai Boukenger had announced retirement from Entertainment Industry. She had announced this one her Twitter while posting the message to fans in two pics.
Here's the Translation of her Last Message.
To all the Fans
Chise Nakamura had announced that she had married to a civilian on January 1, 2018. On April 9th, she had announced that she is pregnant. On August 21st she had given birth to a baby boy.