He is scheduled to leave Japan on the ---出発日--- ,2019 and to stay in your country about 30 days. (数次の場合は、7 days and enter several times during one yearを付け加える).
I hereby certify that we will bear and guarantee all the expenses pertaining for his travelling, accommodation, and any other incidental expenses incurred by his trip to and from your country.
I appreciate it very much if you would kindly extend your special consideration to the issuance of your necessary (multiple) visa on his passport, at your earliest convenience.
I would like to take this opportunity to inform you that
---氏 名--- who is a staff member of our company,
is assigned to proceed to your country for the purpose of --目的（詳しく）--.