This is a Japanese-language illustration (art) book.
Here's a limited-edition set offering from Kodansha that's published in commemoration of the 20th anniversary of "Oh My Goddess!," consisting of an arranged starter deck of 45 trading cards featuring illustrations of characters from "Oh My Goddess!" and "You're Under Arrest," plus a guide book containing details on how to play the game and a catalog of the trading cards. Out of 45 cards from the starter deck, there are five cards (shown in the second and third photos below) that are only available with the starter deck--and one of the five will be signed by creator Fujishima-sensei! The guide book also covers details on game rules, flow of the game, and building up your deck structure. Not to be missed!