Hello Koga san,
How are you doing? I am so sorry that I did not contact you for a long time. After I came back from Japan I was really busy with work. And I lost my cellphone that why I could not contact you. By the way, I heard from Okumura san that you are also busy because your son start a business. I hope your son's business will be successful. Now I move back to work in my hometown, Khonkaen. From now I will have more free time so I will try to arrange my time to visit you in Saga again.
Take care,
Mai