from Hikki's website:

Ten -
<CONTENTS>
* Original text (15,000 characters) written by
Utada Hikaru
* Summary of Official Interview 1998-2008
(Text by Yasue Matsuura)
- From her debut to the album "HEART STATION"
* Utada Hikaru quotations
- Collection of quotations spanning over 10 years
and selected by the artist
* Photographs
about 200 images
* 512 pages

Sen-
<CONTENTS>
* All entries-dating from Feb. 19, 1999 to Dec. 9, 2008-from the WEB diaries "Message from Hikki" and "Message from Utada Hikaru/Utada" which Utada Hikaru has been writing since her debut.
* The latest original photographs by Yasuhide Kuge, photographer for her album "First Love"
* 512 pages

Both are edited by her.