Reika's first and unfortunately probably only photobook has the title of "Jiyu to Iukoto" which of course you saw above. Reason for thinking it may be her only one is that there's still many members who haven't had a PB yet plus the gals whose books were huge sellers will no doubt have a second or third PB coming out.
Think the PB sales increased too quickly, this photobook has sold between 45-50,000 copies which is an extremely high total. A year or longer ago all Nogi fans would have been raving at that sales total but of the five books released this year it's sold the fewest. Had it come out a year ago it would have been the fourth best seller out of the member's first ten books, actually can't recall any other J-Pop Idol whose PB sales topped Reika's this year.
That's okay though if Reika never has another book, she did have this one which has some mighty fine pics and it was a solid seller in most fan's eyes. The pics for the book were shot in Malaysia on the islands of Ipoh and Langkawi. Many fans think she looks like she could come from Malaysia or even Thailand and I agree with those thoughts, don't think either parent came from outside of Japan. The PB was released on March 8th, she had an event for it which there is a post for. Reika isn't a prime example of a gravure model though she does look quite good in these pics, really think all are extremely terrific. Enough of the gibberish as this is a huge collection of pics which total over a hundred, shame these books don't come with a video of the photo shoot.