Josie Tada, from Samoa, has been living in Japan for the past 26 years and is set to be in the crowd at Kumagaya to watch the must-win clash.
It will be the first time the countries have played against each other.
"My husband is Japanese. He was a Japanese volunteer in Samoa when we met each other, and we got married then came to live in Japan," she said.
The mix of two different cultures took some getting used to, she said.