Both nations did more than was required, Ireland needed a 2-0 victory, while Germany needed a draw.
German hopes took an early blow when Carsten Ramelow was dismissed in the first half, but Marco Bode settled the nerves early in the second half. Miroslav Klose completed the scoring and Patick Suffo levelled the sending off count.
Germany are now likely to encounter either South Africa or Paraguay in round two.MATCH REPORT
Over in Yokohama, a Robbie Keane goal set Ireland on their way to the second phase, but it took a 61st minute goal from Gary Breen to finally settle the nerves and set up a likely meeting with Spain on Sunday. Damien Duff added a third late on.MATCH REPORT
Group E came to a conclusion with Christian Ziege's Germany clinching top spot after a 2-0 win over Cameroon in Shizuoka, while for Ireland it was Mission Accomplished with a 3-0 triumph over Saudi Arabia.