"Courage" is a song from the anime series Sword Art Online, in the original key of B flat minor. It was first featured as the opening theme song for the second season of the series, titled Sword Art Online II. The song is performed by Haruka Tomatsu, a Japanese voice actress and singer known for her portrayals of various anime characters. The composition of "Courage" is credited to Tomoya Tabuchi, a Japanese musician and producer. As for trivia, "Courage" debuted at number 4 on the Oricon Weekly Singles Chart in Japan. The melody of the song invokes a sense of determination and resilience, with a catchy and lively tune that captivates listeners.