Sakata-san!
Thank you for your email.
Maybe I think the person in charge of kfk designer is
1. K2 : Mr.Ueda team
-email address
Ueda-san : t-ueda@kf-k.co.jp
Hirano-san: s-hirano@kf-k.co.jp
2. X11Q and P12C : Mr.Kikuchi team
-email address
Kikuchi-san : s-kikuchi@kf-k.co.jp
Saito-san : t-saito@kf-k.co.jp
Best regards!
KFK Harada