Usami made club history by making his professional debut for Gamba Osaka at the age of 17 years and 14 days and scoring a goal in the same match to become the youngest player to achieve both feats for the club, breaking the records previously set by Junichi Inamoto.

[7] In June 2011, it was confirmed that Usami would be loaned out to Bayern Munich,[8] with an option to buy next summer.

Usami told the media in a news conference that a chance like that did not come every day, and that he was looking forward to this big challenge.

When he was asked about Bayern's current first-team players, he said: "I want to improve my skills to the point, where I can take their places."

Usami scored his first competitive goal for the Bavarians on 26 October 2011, in a DFB Cup match against FC Ingolstadt, after coming off the bench in the 73rd minute.