SHIZUOKA – Hosts Japan produced a stunning performance to upset the much-fancied Ireland 19-12 at the Rugby World Cup in a pulsating game at the Shizuoka Stadium on Saturday.In a shock result that rivals their “miracle of Brighton” defeat of South Africa at the 2015 tournament, the Brave Blossoms took the lead through a Kenki Fukuoka try halfway through the second half and hung on desperately with a courageous defensive effort.