Business has boomed with sales of 20 million yen (US$177,500) this year, up from just two million yen when he started a decade ago.

“We cannot keep up with the demand,” said the 74-year-old, who employs just a handful of staff.

But he acknowledged concern about the impact of the free-trade deal, which will eliminate the hefty 29.8 per cent tariff currently imposed on imported cheese.

“I’m worried for the long term,” Ochiai said at his small factory in the mountainous city of Nasushiobara, north of Tokyo, as colleagues busily shaped and wrapped speciality cheeses.

“I think the price competition will be fierce. It’s hard for us to lower the price because it takes time and effort for small cheese makers,” he said, adding that milk is much cheaper in Europe than in Japan.

The deal signed in July – the largest ever negotiated by the EU – creates a huge free-trade area covering nearly one-third of global GDP, eliminating tariffs for everything from Japanese cars to French cheese.

Touting the deal, Prime Minister Shinzo Abe said Japanese people would “be able to enjoy excellent wine or cheese from Europe”.

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Japanese consumption of cheese is increasing, from 279,000 tonnes in 2007 to 338,000 tonnes a decade later, according to the most recent statistics from the farm ministry.

But there is plenty of room for growth. Per capita, annual consumption is a scant 2.66 kilogrammes (5.86 pounds) compared to 27.2 kilogrammes in France, 24.7 kilogrammes in Germany and a whopping 28.1 kilogrammes in Denmark.

Around three-quarters of the cheese consumed is imported, mostly from Australia and New Zealand.

Hundreds of kilometres to the north, on the island of Hokkaido where most Japanese dairy products are made, cattle farmers are also watching trade developments with unease.

“We’re concerned that demand for cheese made in Japan might be lost,” the Japan Agricultural Co-operative in Hokkaido said.

Another worry was the possibility that cheese manufacturers facing greater competition might in turn pressurise dairy farmers to cut their prices. Almost all of the milk used in cheese production comes from Hokkaido.

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Keen to support domestic farmers – a key political support group for Abe – the government has already announced measures to cushion the impact.

Abe’s administration has earmarked 15 billion yen in subsidies “to counter the increase of European cheese before the trade deal takes effect,” according to the farm ministry.

Manufacturers can use the subsidies to expand their facilities, attend training overseas to improve quality or to promote cheese consumption.

Ochiai is pinning his hopes on the cheese tastes of Japanese consumers, who tend to prefer milder varieties.

And while an invasion of French cheese might worry some, for others it comes as a boon.

Vinos Yamazaki, a wine and cheese importer with 25 shops mostly across Tokyo, sees the deal as an opportunity to expand its customer base.

The company handles more than 30 kinds of cheese imported mainly from France at a price of some 1,000 yen per 100 grammes.

“Female customers in their 40s and 50s come here to buy cheese together with wine,” said Yoshihiro Yao, a shop manager in the historic Nihonbashi area.

“But if the price of cheese goes down, we expect a wider range of customers”, he said.

“I think more people are likely to eat cheese on a daily basis.”