Formed in 2012, Lenny code fiction is a four-member Japanese rock band. The band is made up of vocalist and guitarist Wataru Katagiri (片桐 航), guitarist Sora (ソラ), bassist kazu, and drummer KANDAI.

In 2016, they signed to Ki/oon Music, a subsidiary of Sony Music Entertainment Japan. They released their first single on August 31, 2016 titled “Key -bring it on, my Destiny-”. The song was used as the fifth opening theme song for the anime series D.Gray-Man Hallow. Shortly after the release of their first single, on November 9, 2016, they released their second single “Flower”. The song was used as the first opening theme for the anime All Out!!

Since their debut, the band has released one album and five singles, said songs having been featured in popular anime series including “Make my story”, which was used as the fifth opening theme for My Hero Academia, and “脳内 (Nounai)”, the second ending theme for Fire Force.