Interest in international affairs jumped 25.8 percentage points month-on-month to 74.8 per cent. The attention spike was brought on by the Greek referendum on austerity measures, as well as the month's declining Chinese stock market.

Interestingly, the investment appeal of the financial sector fell 10.9 points from June. Pharmaceuticals replaced automobiles as the most appealing sector over a three-month horizon.

Still, Toyota Motor kept hold of its dominant position as the one Japanese stock most investors would like to have in their portfolios.

As a potential Greek exit loomed over the eurozone, appeal of the euro stooped 21.5 percentage points month-on-month. Meanwhile, investment appeal of the Japanese yen rose 13.6 points, the largest climb of any currency.

The Nomura Individual Investor Survey was conducted between 6-7 July and took responses from 1000 investors from several regions across Japan.