There's no doubting that the Irish love a good underdog story, and Japan's historic win over South Africa certainly qualifies as that today.

In Cardiff at the fan village, Irish fans who were still in a good mood following an impressive win over Canada, but they clearly hadn't had their fill of celebrating just yet. 

As Japan went over for a thrilling try in the dying stages to give them the win, a fan zone in Cardiff filled with Irish supporters went crazy as everyone's new favourite second team wrote their name into the history books. 

😃😃😃 👍 Is this how you're feeling after Japan's incredible win over South Africa? #RWC2015 https://t.co/jEBiz5XQaK

— BBC ScrumV (@BBCScrumV) September 19, 2015