Netsujou no Spectrum (熱情のスペクトラム)

"Netsujou no Spectrum" (熱情のスペクトラム) is a song by Ikimonogakari, released on 15 October 2014 as the group's 28th single. It was used as the first opening theme for the 2014 television anime The Seven Deadly Sins (七つの大罪 / Nanatsu no Taizai), which was animated by A-1 Pictures.

Yoshiki Mizuno wrote the lyrics and music, and Seiji Kameda arranged the track. The single also includes "I love you," and "Aimai na Ookami" (曖昧なオオカミ), and the song later appeared on the album "FUN! FUN! FANFARE!", released on 24 December 2014. On Oricon's weekly singles chart, "熱情のスペクトラム" peaked at No. 7, and it received a Gold certification from the Recording Industry Association of Japan in the digital download song category.