Conversation so far:
what is Ai Otsuka's love piece debut?
Love Piece is Ai Otsuka's fourth album.
did Love Piece by Ai Otsuka do well?
did Ai Otsuka have any other releases, besides Love Piece?
Ai Otsuka released her first best hits compilation album, titled Ai am Best, on March 28, 2007.
Are there any other interesting aspects about this Ai Otsuka article?
Ai am Best by Ai Otsukaalso features two bonus tracks—one for the DVD, and one for the CD.
What dvd was released with Ai Otsuka's Ai am Best album?
Ai am Best features two bonus tracks—one for the DVD, Best of Babashi“.
How well did Ai am Best by Ai Otsuka do?
Ai am Best topped the Oricon charts.
What cds were released with Ai Otsuka's Ai am Best album?
Ai am Best features two bonus tracks— one for the CD, Babashi.

Question: How many copies were sold?
Self-contained rewrite: How many copies of Ai am Best by Ai Otsuka were sold?