Group producer Tsunku originally planned on selecting only three members; Rika Ishikawa, Hitomi Yoshizawa, and Ai Kago were chosen.
"Happy Summer Wedding" was released on May 17, 2000, marking Tsuji's debut just one month before turning age thirteen.
They both retained these personalities for their initial years with Morning Musume, but by 2003, younger members had joined the group; Kago and Tsuji resorted to maintaining their strong friendship.
She regained the title in January 2004 and simultaneously held it with Kago until September 2005, when Ashrita Furman of Brooklyn, New York City surpassed their record.
Project's official website announced on January 30, 2007 that Tsuji would be voice-acting as a guest for Keroro Gunso the Super Movie 2: The Deep Sea Princess.
(『いつの日君帰る』, Itsu no Hi Kimi Kaeru), which opened on May 4, 2007 at the Nissei Theatre in Tokyo, where she was to perform until the 22nd, but due to gastroenteritis, she was eventually replaced by Hitomi Yoshizawa.
Tsuji voiced Athena in the animation series Robby & Kerobby, and released a single "Koko ni Iruzee!"
On January 30, 2009, Tsuji started an online blog on Ameba, the title of which is commonly rendered as either Non Peace or Non Piece (のんピース).
[17] On December 25, 2011, it was claimed that Tsuji was living separately from Suguira due to personal financial problems, although rumors of a divorce were denied.
Tsuji's agency countered that the living arrangements were in preparation for her full-time return to the entertainment industry and had nothing to do with the state of her marriage.
A press conference was held[19][20][21] in which both entertainers expressed their apologies to the public, amid praise and criticism coming from other renowned artists.
Hitomi Yoshizawa, who worked alongside Tsuji while they were both in Morning Musume, replaced her and was forced to learn all the required lines for When Will You Return?
"[25] Asami Abe was forced to fill her position in Gyaruru, and Risa Niigaki eventually played her role as Athena in Robby & Kerobby.