I'm not sure with Kitagawa Keiko but with Fukushii Kozue, as I remember, Sho had mentioned in Himitsu no Arashi that they've hung out together to watch butai as a friend.

Thank you for subbing the Sho's Secret Gateway with Okada-kun! I love it so much, especially when Okada-kun scolded Sho for being smartypants also tried to kill Sho with snowball fight. XD