TENMON featuring ELISA is a musical collaboration that pairs composer and arranger TENMON with vocalist ELISA for theme songs in anime productions, most notably the opening theme for the 2008 television series ef - a tale of melodies.

TENMON, born Atsushi Shirakawa in Tokyo in 1971, is a composer and arranger whose career began in the early 1990s as a member of the Falcom Sound Team J.D.K., where he composed music for numerous video games. He began a long-term collaboration with director Makoto Shinkai starting with the short film She and Her Cat in 1999, subsequently composing the soundtracks for Shinkai's theatrical works including Voices of a Distant Star, The Place Promised in Our Early Days, and 5 Centimeters Per Second. In the mid-2000s, TENMON worked extensively with the game brand minori, composing the music for the visual novel ef - a fairy tale of the two. and its anime adaptations, ef - a tale of memories. and ef - a tale of melodies., often in collaboration with fellow composer Eiichiro Yanagi.

ELISA is a Japanese singer who debuted in 2007 with the song euphoric field, the opening theme for ef - a tale of memories., also composed by TENMON. Born in Kanagawa Prefecture in 1989, she studied piano and choral music from a young age before being discovered through a modeling contest where she expressed her desire to sing. Her vocal style is characterized by a clear, transparent quality that became strongly associated with the ef franchise.

The central work of this collaboration is the song ebullient future, which served as the opening theme for ef - a tale of melodies. The single was released on November 5, 2008, through Geneon Entertainment. For the anime series, multiple versions of the song were utilized. The primary opening theme for most episodes was ebullient future (English) by TENMON featuring ELISA. Episode six featured ebullient future (Instrumental) by TENMON. Episode eleven introduced ebullient future (English 2nd Version) by TENMON featuring ELISA. The same episode also featured euphoric field by Tenmon feat. ELISA, reprising the opening theme from the first season. The Japanese version of the song was used as an ending theme in episode twelve performed by ELISA alone.

The musical identity of TENMON featuring ELISA is defined by emotional, piano-driven compositions layered with string arrangements, characteristic of TENMON's broader soundtrack work. The ebullient future single lists TENMON as composer and arranger for both the English and Japanese versions, with lyrics by Emi Nishida for the English version and nbkz Sakai for the Japanese version. The original soundtrack for ef - a tale of melodies., titled ORIGINAL SOUNDTRACK 〜elegia〜, credits TENMON as arranger for the vocal tracks featuring ELISA and Yumiko Nakajima.

Beyond the ef franchise, ELISA performed ebullient future as a track on her 2012 best-of album rainbow pulsation - THE BEST OF ELISA, alongside her other anime theme songs such as euphoric field, Real Force, and Wonder Wind. TENMON continues to work as an independent composer through his personal circle Densou Gakudan, active in animation and game music including work on the Chinese animated series Link Click.