A Star Brighter Than the Sun New Trailer Reveals Additional Cast, Ending Song

The previously announced A Star Brighter Than the Sun anime has unveiled a new trailer, revealing an additional cast member and the ending theme song. Haruka Shiraishi joins the cast as Subaru Kamishiro while Wanuka sings the ending theme song “Saishin-wa.”

Studio KAI is animating the series set to premiere on October 2, 2025. Aya Kobayashi is the director, Yasuhiro Nakanishi is the scriptwriter, Jin Feng Zeng is the character designer, and Miki Sakurai is the music composer. The opening theme song “Stellar Days” by Motohiro Hata and the voice cast consists of:

• Minori Fujidera as Sae Iwata
• Yuki Ono as Koki Kamishiro
• Hina Yomiya as Hisui Onodera
• Taito Ban as Yota Ayukawa
• Mutsumi Tamura as Mio Kagawa
• Ryota Osaka as Yushin Izawa

The anime is based on a manga series by Kazune Kawahara, which has been serialized in Shueisha’s Bessatsu Margaret shojo magazine since June 2021. VIZ Media licensed the manga series in English and they describe the story for the first volume as follows:
Sae and Koki have been friends since childhood. One fateful day at the end of middle school, she has a revelation: Koki has grown up! Now they’re in high school, and she has another revelation: she has feelings for Koki! But Sae isn’t the only girl who does… The question is, who does Koki have feelings for?!

Source: A Star Brighter Than the Sun Official Website
© Kazune Kawahara / Shueisha, A Star Brighter Than the Sun Production Committee