Adrena

"Adrena" (Japanese: アドレナ, Hepburn: Adorena) is a song by Japanese duo Yoasobi from their fourth EP, The Book For, (2026). It was released as a single on January 4, 2026, through Echoes and Sony Music Entertainment Japan. The song serves as the opening theme for the 2026 anime series Hana-Kimi, and was based on Fuyu Tsuyama's short story Magical.