I was just at the Miyagikyou distillery and they have bottlings available only on site, which it appears is what you've received.
I bought a couple of them, but the presentation in Miyagi was quite a bit quieter and as I have yet to get to the Yoichi distillery I can only assume that they do what they do separately on many of these issues. Possibly since Yoichi is the first distillery founded by Masataka Taketsuru, they thought it appropriate to make their version a bit on the fancier side?
The whisky was definitely not distilled in Minami Aoyama, but rather in Yoichi.
Very nice presentation and I love how they put 'whisky' right in the middle of all the kanji.