Maasa Sudo

In 2002, Sudo Maasa joined Hello! Project as one of the fifteen Hello! Project Kids. She made her debut as one of the 4KIDS in the Minimoni ja Movie Okashi na Daibouken! film as well as on Minimoni's 6th single.
In 2004, Sudo was one of the eight members selected to form Berryz Koubou.

Sudo was a member of Little Gatas and Mix Gatas until she was added to Gatas Brilhantes H.P. in 2007.

In 2009, Sudo was assigned to be a part of the new shuffle group ZYX-α along with Niigaki Risa, Kusumi Koharu, Umeda Erika, Tsugunaga Momoko, Tokunaga Chinami, Wada Ayaka, and Ogawa Saki.
Sudo, along with four other members of °C-ute and Berryz Koubou left the Hello! Project futsal team, Gatas Brilhantes H.P.. The members left of their own violition due to feeling that they could not perform as high level players due to their level of ability.

Sudo is the lead role of the live action movie adaptation of the manga "Light Novel no Tanoshii Kakikata" (Writing Light Novels is Fun) as the character Yabusame Tsurugi (流鏑馬剣).
The story centers on Yakumo Atae, a first-year student who knows the hidden secret of his fearsome classmate Tsurugi Yabusame — while she is the school's strongest girl, she is also a budding light novel author under the penname Mio Himemiya. Tsurugi is stuck in a huge slump while writing her new romantic comedy. Yakumo's cousin Kokona Atae happens to be Tsurugi's editor, and Kokona suggests that Yakumo and Tsurugi become a couple so that Tsurugi can know the experience of romance.

Sudo, Natsuyaki Miyabi and Yasuda Kei will perform in a comedy play titled B・B ~bumpy buddy~. It will be performed on May 15, 2012
On July 25 it was announced that Berryz Koubou's Sudo Maasa, Shimizu Saki, Kumai Yurina, Sugaya Risako and ℃-ute's Yajima Maimi, Nakajima Saki and Hagiwara Mai will be performing in an stage play titled Cat’s Eye based on a manga. The stage play will run from 9/22 till 9/30