Shounen Heart

"Shounen Heart" is a 2005 song by HOME MADE Kazoku that became the second opening theme for Eureka Seven (交響詩篇エウレカセブン), a television anime from Bones. Released on August 3, 2005 as the group’s sixth single, it also appears on the studio album musication. Lyrics were written by KURO, MICRO, and U-ICHI, and the music was composed by KURO, MICRO, U-ICHI, and Takahiro Watanabe.

The track sits within J-Pop but leans toward the group’s hip-hop identity, building its hook from alternating rap verses and a singable chorus. Its momentum favors rhythmic bounce and a buoyant melodic lift over hard-rock weight.

That sound fits Eureka Seven well: the sense of motion in the arrangement matches a series built around skies, Trapar, and the pull of freedom. "Shounen Heart" also stands out in anime theme lineups for bringing a rap-oriented approach to a TV opening. The single reached No. 7 on Oricon’s singles chart.