Mutsumi Tamura Joins Millennium Family as Youngest Sibling Arthur
The immortal Benfield family’s fifth son joins the cast of the upcoming TBS anime.

Mutsumi Tamura will voice Arthur, the Benfield family’s fifth son and youngest child, in Millennium Family. The television anime will air on TBS and other stations.
The staff of Millennium Family (Odoru Sennen Kazoku) announced Tuesday that Mutsumi Tamura will voice Arthur. He is the Benfield family’s fifth son and youngest child.
The television anime, adapted from Sho Kasugai’s manga, will air on TBS and other stations.
The other announced cast members are:
- Rikuya Yasuda as Theo
- Katsuyuki Konishi as Hayden
- Ryōta Suzuki as Hugo
- Lynn as Eve
- Taihi Kimura as Noel
- Haruna Mikawa as Raine
AI localization company Orange Inc.’s e-bookstore service emaqi licensed the manga. Its story follows seven immortal siblings born in England who have humanity’s ultimate dream: eternal life.
That gift makes them targets for:
- The criminal underworld
- Corrupt hospitals
- International military organizations
After centuries apart, the siblings reunite to begin a new chapter in their lives.
Kasugai launched the manga in Shōnengahōsha’s Young King Ours magazine in March 2021. Shōnengahōsha will release its 10th compiled book volume on January 29.
Masato Jinbo directs the anime at PartsCraft and supervises the scripts. His previous directing credits include:
- Fate/kaleid liner Prisma Illya 2wei!/2wei Herz!/3rei!!
- Chaos;Child
- The Rising of The Shield Hero Season 2
Hiroshi Yoneda, whose credits include Fate/kaleid liner Prisma Illya: Vow in the Snow, serves as character designer and chief animation director.
Sources: Press release via ANN







