The official website for the Sirotan television anime — based on Creative Yoko’s beloved seal mascot character — has unveiled a new promotional video alongside the announcement of three additional cast members.
Voice Cast
- Aoi Yūki — Sirotan (previously announced)
- Miyu Hanasaki — Rakkoinu
- Rina Hidaka — Sheru
- Riyo Iwai — Ramune
Aoi Yūki voices the titular white seal, Sirotan. The actress had previously played the character in a short animation published on the Sirotan TV YouTube channel.
Staff
Arisa Okada is directing the series at studio Lesprit, while Sei Yoshitsuki is serving as series supervisor and scriptwriter. The anime is a co-production between TV Asahi and Shinei Animation.
About the Mascot
Creative Yoko originally designed the Sirotan mascot in August 1999. Two decades later, in 2019, the Japan Anniversary Association officially designated August 8 as Sirotan Day.

