Doan equalised in the 75th minute before Asano showed lovely control and smashed the winner in from a tight angle -- causing an explosion of joy among the Japan bench and head shaking among German fans used to watching both players ply their trade in the Bundesliga.
Twitterati couldn't contain their joy at the upset and hailed Japan for 'pulling off a Saudi Arabia'.
It's not the first time that fans of the Samurai Blues have cleaned up stadia after matches.
Here are glimpses of unbound joy for the Samurais...
The Manchester United midfielder, who was substituted in the 67th minute, also made a statement by wearing custom designed boots with rainbow colours to protest FIFA's rule against OneLove armbands at the World Cup.
Germany's players placed their hands over their mouths during a team photograph ahead of their game against Japan on Wednesday as the row over FIFA's threat of sanctions over the 'OneLove' armband continued.
The fans were in full voice during the national anthems and the stadium was bouncing.
Soccer fans watch the telecast of the World Cup game between Argentina and Saudi Arabia on a Kolkata street with the God Of Football (Diego Maradona holding the 1986 World Cup trophy poster) to keep them company.
"Our team fulfils our dreams!" and "Where is Messi? We beat him!", the green-clad Saudis chanted over and over in the Lusail Stadium, on their feet and greeting every clearance, including one headed off the goal line with a deafening roar.
Here's a glimpse of the carnival-like atmosphere in the stands...
Beckham, who played for Manchester United and Real Madrid as a midfielder, is working for Qatar, which has been criticised for its treatment of foreign workers, LGBTQ+ rights and restrictive social laws.
Iran's players did not sing the Iranian national anthem in an apparent show of support for anti-government protesters back home.
Iran Goalkeeper Alireza Beiranvand suffered a head injury after colliding with a team-mate during the first half of his nation's game against England in the FIFA World Cup at the Khalifa International stadium in Doha.
Bollywood star Ranveer Singh had a day to remember as he caught up with some of the world's greatest sportspeople at the Abu Dhabi F1 Grand Prix at the Yas Marina Circuit on Sunday.
A confectioner in Kolkata displays confectionery created in the likeness of Cristiano Ronaldo and Lionel Messi on Sunday, the opening day of the FIFA World Cup 2022.
Two of the greatest football players of the 21st century, Lionel Messi and Cristiano Ronaldo broke the Internet by posting a picture as part of the promotional campaign for the FIFA World Cup, in which they were portrayed playing chess against each other.
The vice president was in Doha to attend the inauguration of the FIFA World Cup.
Ecuador mints commemorative coin to mark World Cup participation.
Just a few days back it seemed like Qatar, which has strict controls on alcohol, would relax their laws for the football extravaganza as consuming alcohol in public places is illegal in the Gulf country.
Football has an unbelievably crazy fan following in Brazil, who are the only country to appear in every World Cup and the only nation to win the tournament five times.