The 2012 single "Yume Sekai" showcases Tomatsu's vocal range within a pop-jazz framework. The track was featured as the ending theme for the anime series "Moyashimon Returns."
- "Yume Sekai" was released as a CD single by MusicRay'n Inc. on July 25, 2012. The single reached number 47 on the Oricon Weekly charts. It was Tomatsu's fifth solo single.
- The A-side "Yume Sekai" was produced by Yasuhiko Hoshino, known for his work with various J-pop artists. The B-side, "Kimi to Issho" (君と一緒), was written by Tomatsu herself. The single was released during a period of prolific output for Tomatsu, both musically and in her voice acting career.
- "Yume Sekai" was chosen as the ending theme for the second season of the anime series "Moyashimon," subtitled "Returns." The series itself is known for its unique blend of science and culture, centering on microbes. Tomatsu's music provided a melodic counterpoint to the show's themes.
Haruka Tomatsu is a Tokyo-born pop singer and voice actress. She is a prominent voice in anime, known for roles like Asuna Yuuki in Sword Art Online.
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