YOU21 is Kikkawa Yuu's second photobook. It was released on May 1, 2013.
The photobook contains photos taken during the last 2 years for UTB (Up to Boy) magazine and unreleased shots. It includes pictures of Kikkawa Yuu showing various expressions and wearing many outfits such as swimsuits.
- The photobook was made to commemorate Kikkawa turning 21 years old and was released on her 21st birthday.
- Listing: Wani Books
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