Mutsumi Tamura has joined the voice cast of the Millennium Family TV anime as Arthur Benfield. The announcement, confirmed on November 10, identifies Tamura as the voice behind the fifth son and youngest child of the central Benfield family.

Arthur is described as a mature and highly intelligent young boy, a role that aligns with Tamura's history of voicing young male characters.

What We Know

According to Anime News Network, Tamura joins an ensemble cast that features Rikuya Yasuda as Theodore "Theo" Benfield and Katsuyuki Konishi as Hayden Benfield. Other confirmed cast members for the siblings include Ryota Suzuki as Hugo, Lynn as Eve, Taihi Kimura as Noel, and Haruna Mikawa as Raine.

Animation studio PartsCraft is handling the production. Masato Jinbo is serving as both the director and the person in charge of series composition and scripts. Hiroshi Yoneda is providing the character designs and acting as the chief animation director. The series, titled Odoru Sennen Kazoku in Japanese, is an adaptation of the manga by Sho Kasugai, which began serialization in Young King OURs in March 2021.

Why It Matters

The Millennium Family story centers on seven immortal siblings born in England who eventually reunite in modern Japan. Their longevity makes them targets for both criminal organizations and scientists, creating a narrative that blends family drama with suspense. Mutsumi Tamura's casting as Arthur is the latest update following the anime's initial announcement in July 2026.

Where to Read

No international streaming platforms have been announced for the anime as of November 12, 2026. For those looking to catch up on the source material, the manga is published in English by Orange Inc. through the emaqi digital platform. In Japan, Shonen Gahosha has released nine tankobon volumes as of July 30, 2026.

What Happens Next

Tokyo Broadcasting System (TBS) is the confirmed broadcaster for the series in Japan. While the core staff and cast are now public, no specific premiere date or broadcast season has been announced as of November 12, 2026.