RIKAKO is Sasaki Rikako's first solo photobook. It was released on July 20, 2015, published by Wani Books.
A special making-of DVD was released separately on September 15, 2015 through e-LineUP!.
On March 26, 2021, the eBook edition was released through Amazon Kindle, Rakuten, 7net, and DMM.
"In October of last year, S/mileage was renamed into ANGERME and Sasaki joined as a 3rd generation member from the Hello! Pro Kenshuusei. As such, she announced her first photobook only half a year after her debut!
Set in Okinawa, 'RIKAKO' shows her in her full innocence. She is not aware of the camera, no matter if in the mountains or the sea, running around healthy and laughing. What a refreshing feeling...
One book is not enough to capture the shine and overwhelming presence of this girl. Feel a bright future in this first photobook."
- "佐々木莉佳子・浅倉樹々の電子版写真集がリリース！" (in Japanese). Hello! Project. 2021-03-24.