Conversation so far:
What did Ai Otsuka do in 2006?
In April 2006, Ai Otsuka released Frienger. The promotional video was used as the commercial song for the Toshiba W41T 4 GB MP3 mobile phone.
Where was the video for Frienger by Ai Otsuka shot?
The promotional video for Frienger was shot in Taiwan.
Was Ai Otsuka an actress and a singer?
In June 2005, Ai Otsuka made her acting debut with the drama Tokyo Friends.
What singles did Ai Otsuka release?
Ai Otsuka debut single, entitled Momo no Hanabira, was released on September 10, 2003.
Did Ai Otsuka have any bestsellers musically?
Ai Otsuka is best known for her 2003 hit Sakuranbo, which stayed in the Top 200 Oricon Weekly Singles Chart for 103 weeks.
Did any other Ai Otsuka songs make it on the charts, besides Sakuranbo?
Amaenbo peaked at the sixth position on the Japanese charts, while at the same time Sakuranbo was fifth.
Is there any more interesting information about Ai Otsuka?
In November 2004, the follow-up to Ai Otsuka's Love Punch, Love Jam, was released, which met even greater popular success.
Did any other Ai Otsuka albums do well, besides Love Punch and Love Jam?
Ai Otsuka also sang the opening theme for Tokyo Friends, Yumekui, which was released as a new single on August 2, 2006. It debuted fifth on the weekly chart.

Question: How many copies total did Yumekui sell?
Self-contained rewrite: How many copies total did Yumekui by Ai Otsuka sell?