Congratulations to So-san for successfully promoting to Black Belt!
お仕事が忙しい中も頑張って稽古にいらしていた結果ですね。昇段審査では素晴らしい技を見せてくれました。
This is the result of your very hard work in training in spite of your busy work schedule. You showed mastery of the required techniques in your black belt promotion examination.