In 2002, she successfully passed the Hello! Project Kids Audition. Sudo is currently a member of the group Berryz Kobo. In March 2009, she released her first Photobook, called "Maasa". In 2010, it was confirmed that she was going to be the lead-actress of the movie Light Novel no Tanoshii Kakikata!, based on a light novel with the same name, together with earlier hello!project egg Arisa Noto, Hisanori Sato and others. The movie premiered in cinemas in Japan in December 2010, and the DVD was released March 3, 2011. Maasa played the role of "Tsurugi Yabusame".