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100 years ago, world war 1 had barely finished. a Japanese "vineyard" learned through the western allies an incredible technique to sell their product with prime flavor. "The aging of wine". This could guarantee a boom in the family business. Of course, the process would still take too much time, so for the time, they had to act as a third party before launching their own brand of wine. Japan at the time, probably still had trouble importing grapes, since this was before the invention of consumer-friendly-refrigerators, So, they got around this by a technicality: selling liquor doused with plums, and misleading the consumers by calling it "wine". Of course, wine, as it were, tastes better because of the fungus that growns in the fruit, through a process called "the noble rot" and the aging "pickles" the fungus and preserves it. Which Japanese businessman may not know about. These bottles get outrageously expensive prices, so to protect them, they probably dig deep underground, nothing more modest than a simple hole in the sand, maybe.
Before the internet, before anime, before movies, before Disney and his brother, Hitler. A plum wine survived WW2, the invasion troops, the fall of Japanese empire, 1968 Tokachi earthquake, The 80's boom and the 2011 earthquake.
It survived all that, to put your stupid anime girl and sell it as a bonus in a package of toys. chug history down the drains, simps.