I'll Believe is the first ending theme song of the anime series Shakugan no Shana Final. It is performed by the band Altima. It was written and sung by Maon (Maon Kurosaki), while the rap lyrics and the rapping was done by Motsu (Mototaka Segawa). Sat (Satoshi Yaginuma) handled the composition of the song. It peaked at #20 in the Oricon charts. "I'll Believe" was released as a single on December 7, 2011. The song was used as the ending theme for episodes 1-13 of the third season.