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Toshihiko Seki Known for Voicing Muzan Voices Final Boss in Doraemon Birthday Special Airing September 6

The upcoming Doraemon Birthday Special, set to air on TV Asahi on September 6 at 6:56 PM, has announced Toshihiko Seki as the voice of the final boss, the Lord of the Sky Castle. Known for portraying Muzan Kibutsuji in Demon Slayer, Seki returns to the Doraemon franchise for this movie-themed adventure episode. The special will follow Doraemon and his friends as they take on heroic roles in a cinematic world filled with danger and excitement.


Doraemon faces off against the Lord of the Sky Castle in the Birthday Special airing September 6, 2025

Doraemon faces the final boss, voiced by Toshihiko Seki, in the Doraemon Birthday Special © Fujiko Production, Shogakukan, TV Asahi, Shin-Ei Animation, ADK


Toshihiko Seki Cast as the Lord of the Sky Castle

Toshihiko Seki has been announced as the voice of the final enemy, the Lord of the Sky Castle, in the Doraemon Birthday Special. Seki, who recently gained attention for voicing Muzan Kibutsuji in Demon Slayer, brings his talent to the iconic children's series once again. Reflecting on his return, Seki shared that he remembered being invited to the Doraemon series several decades ago and expressed his excitement about participating in the special.

“I’m honored to be involved again after such a long time,” he said. “It’s a thrilling and fun project, and I hope I was able to contribute even just a little.”


Doraemon faces off against the Lord of the Sky Castle in the Birthday Special airing September 6, 2025

Doraemon faces the final boss, voiced by Toshihiko Seki, in the Doraemon Birthday Special © Fujiko Production, Shogakukan, TV Asahi, Shin-Ei Animation, ADK


Movie-Themed Adventure: Can Doraemon and Friends Escape?

The special episode is titled Treasure of the Sky Castle! Legend of the True Hero and takes place inside a fictional movie world. Thanks to the secret gadget “Movie Can,” Doraemon and friends become heroes in different film genres—Nobita as a sheriff in a western, Shizuka as a spy agent, Gian as a masterless samurai, and Suneo as a sci-fi action hero.

However, an unexpected glitch pulls all four into Doraemon’s movie world, where they must locate the treasure of the Sky Castle to exit the story. As they head toward the floating fortress, unpredictable dangers await them.


Doraemon faces off against the Lord of the Sky Castle in the Birthday Special airing September 6, 2025

Doraemon faces the final boss, voiced by Toshihiko Seki, in the Doraemon Birthday Special © Fujiko Production, Shogakukan, TV Asahi, Shin-Ei Animation, ADK


Star-Studded Cast and Guest Appearances

Kenjiro Tsuda makes a special appearance as the narrator of the “Movie Can” gadget. Comedy duo Nishikigoi—Masaki Hasegawa and Takashi Watanabe—also appear as characters in the movie world. Their inclusion adds extra flavor to the already adventurous tone of the episode.

The Doraemon Birthday Special combines action, comedy, and heartfelt moments, promising an unforgettable experience for viewers of all ages.


Toshihiko Seki

Toshihiko Seki


Source : ORICON NEWS