Question for Unilever RFM Ice Cream, Inc.

Good afternoon!
This is Cristine Zeta, personal assistant of Miss Mari Mitsuyama for Hirose Products Co., Ltd from Japan. I would like to know where can we address an invitation letter for a business proposal for Unilever RFM Ice Cream Company.
Your response about this matter will be highly appreciated.

Yours truly,
Cristine Zeta