Being a fan of Sailor Moon for over 20 years now, I feel like I’ve seen almost all the merchandise that came from the anime and manga. However, I was fairly surprised to learn three years ago, that Sailor Moon had some "secret" books that wasn’t really common knowledge. The books I’m referring to, are the "himitsu" books published by Kodansha for the Sailor Moon anime. Not many people know about these two books, but they are mass produced and aren’t really that rare.
"Himitsu" means secret, so its definitely amusing that not many fans know about these two books’ existance. Here is the reason why so few people know about these volumes: It is common knowledge to fans that Kodansha published short hard-cover childrens’ books during Sailor Moon’s run on TV. These hard-cover books are made of board, and have no more than a few pages summarizing the storyline of the anime. Some fans collect these hard-cover books, but most fans do not because they are made to be simplified for pre-school-aged kids.
After publishing 45 hard-cover childrens’ book, Kodansha decided to release a special book for Volume 46, which summarizes the secrets to Sailor Moon. This book was called, "Sailor Moon Himitsu 100" and reveals one hundred secrets from the anime up to Season 3. "Sailor Moon Himitsu 100" was made to be a full length book of 36-pages, and came with a free sheet of stickers inside.
A year later, Kodansha published another special book as Volume 64 called "Sailor Moon SuperS Himitsu Album." This book discussed the secret identities of the Sailor Senshi and covered events up to Sailor Moon Season 4. "Sailor Moon SuperS Himitsu Album" became a bit of a collectors’ item, because it featured a rare image of Sailor Saturn on it’s cover.
I personally don’t think both volumes are very rare. I see them come up in either Yahoo Japan Auctions, Ebay, or even Mandarake once every two months. And they sell for anywhere around $15 to $30 each. They’re pretty cheap compared to other Sailor Moon books; So if you have ever thought about collecting Sailor Moon periodicals, these two would be a great place to start. Enjoy the scans everyone!