To celebrate Ken's 25th anniversary last year , writer Shimada Satoshi whom has traced Ken's music career from the beginning until now interviewed a total of 25 different people which they will share their thoughts about Ken
The final person in the list is Hirai Sawako aka Ken's mum !
https://www.kh25th.net/interview/detail25/
Wow what a way to wrap this up with Ken's mum & this's the 1st time that I've found out what his mum's name is