Courage is a song from Sword Art Online 2, performed by Haruka Tomatsu in the original key of G major. It serves as the opening theme for the Phantom Bullet arc. The composition of the song was done by Tomoya Tabuchi, with lyrics by Tomatsu herself. Interestingly, Haruka Tomatsu not only provided the vocals for the song but also voiced Asuna Yuuki, one of the main characters in the anime series. The song Courage showcases a captivating melody, characterized by its uplifting and dynamic nature, perfectly complementing the intense and action-packed moments of Sword Art Online 2.