Where to buy Kirin Ichiban Shibori Kuro Nama

Dear Japanese,

I’ve had the chance to visit with my wife and friends the Kirin distillery of Sendai. There I truly discovered the flavour of Kirin’s beer. At the end of the tour, there was a tartine session of 3 différents Kirin Ichiban beers: normal, premium, and the Kuro Nama (black beer).

Being Europewan, black béer isn’t unusual, but it’s hard to find good ones. The kirin black beer version : Ichiban shidori Kuro nama is actually super good.

But since my visit of the distillery I CANNOT FIND a place that selles the black kirin beer.

I’ve tried Konbinis (7/11, Lawson, family mart), some supermarket (Daiichi) but still could not find it.

As Japanese, how and where can you acquire the delicious « Kirin Ichiban Shidori Kuro Nama «  beer?

Also, why is it not sold in konbinis? It’s a good beer, it should be present in the stores I mentioned before.

Thank you for you help