I’ve never used that book, so I was going to leave it to someone else to comment, but noone has yet, sooo…
Personally, I wouldn’t use any book that continues to rely on romaji once it’s taught you the kana.
Maybe try http://www.tofugu.com/reviews/short-stories-in-japanese/
Or http://www.tofugu.com/reviews/read-real-japanese-essays-fiction/
Honestly, I’ve never read either of those either, but I have bought the latter one and at least flipped through it. =)
If you live anywhere near a Kinokuniya (which, admittedly, is only found in a few cities outside of Japan) you can quite easily buy light novels in Japanese.