Probably an oversight.
But I have yet to develop any sort of relationship with the folks at Coca-Cola Japan... which is too bad, because they often have some pretty neat stuff to showcase.
For example, Coca-Cola Japan has just released a new bottle for Coke featuring the stylings based on the Ohenro anime, and it is ONLY available in the Shikoku region of Japan...heh... Shikoku-cola.
The bottles first went on sale on May 4, 2018, and feature Ohenro characters Megumi, Chiwa, and Mao.
The popular anime is produced by Ufotable, and is about the three girls following the pilgrimage of the 88 Buddhist temples on the island of Shikoku.
Ohenro is Japanese for "Pilgrims".
In the background is the Onaruto Bridge with connects Shikoku Island with mainland Honshu.
As mentioned, you can only get this bottle on Shikoku, which means traveling to the island—is this a game played up by Japan's Tourist Association?—or see if those greedy (but ultimately smart) Shikokuites (Shikokuians?) start selling bottles on E-Bay...
The 250mm bottles cost ¥125 (about $1.50 Canadian).
And, since you are already there, maybe you should do the Shikoku Pilgrimage (四国遍路, Shikoku Henro)... a multi-site trek of the 88 temples associated with the Buddhist monk Kūkai (aka Kōbō Daishi).
While the pilgrimage is traditionally done on foot, like the girls are doing in the anime, for those who lack the time, you can use a car, bicycle, etc.
Part of the issue is that the walking course is 1,200 kilometers (745.6 miles) long, and is supposed to take between 30-60 days.
While the pilgrimage walk includes 88 temples, there are an additional 20 bangai (unofficial temples)... and here's the rub... in order to complete the Pilgrimage, one must visit the temples in order.
One thousand two hundred frickin' kilometers... I'm going to need a lot of Coke. And maybe someone to carry me.