"Baby" is a song by Japanese duo Yoasobi. It was released as a single through Echoes and Sony Music Entertainment Japan on January 11, 2026. Based on Yasuko Aoki's short story My Dear......, the song serves as an ending theme for the 2026 anime series Hana-Kimi.
An anime adaptation of the manga series Hana-Kimi was first announced in May 2024 by Aniplex. A year later, on September 14, 2025, the company revealed that Yoasobi would perform both opening and ending themes for the anime series, which is set to premiere in January 2026. The themes' titles and snippetsâÂÂopening theme "Adrena" and ending theme "Baby"âÂÂwere unveiled through the anime's promotional video, uploaded on November 8.
On January 6, following the premiere of the first episode, the duo announced the release date of "Baby" as January 11, alongside its cover artwork designed by Kisuke à Âta, featuring the protagonist Mizuki Ashiya's face. The limited double A-side CD single, alongside "Adrena", was released on March 4.
Lyrically, "Baby" expresses an emotional conflict between pure, straightforward, yet unspeakable love for a person. Yasuko Aoki of Studio Monado wrote a short story for the song, titled My Dear......, published on January 10, 2026. It depicts the protagonist Mizuki's bittersweet love with her crush Izumi Sano as she lives in the United States; her friend Julia Maxwell always encourages her. Writing for Rockin'On Japan, Tomohiro Ogawa described the song's lyrics a reminiscence of the duo's song "Ano Yume o Nazotte".
An accompanying music video for "Baby" premiered on January 11, 2026, the same day as the release of the single. Described as "delicate and warm," the animated visual is a story that follows the song's basis, My Dear......; Mizuki's life in the United States and her bittersweet love with Izumi.