To provide a booklet set having a booklet which has a strap mounted thereon and is stored in a box, and also to provide a kit for the booklet set for preparing the booklet set.

The kit 100 for the booklet set comprises: the strap 10; a page sheet 20 (a sheet), a booklet cover sheet and box cover sheet sharing sheet 40; and a booklet cover core and box core sharing sheet 70 (a sheet). Image data owned by a user is stored in an image forming apparatus 200 (or a personal computer PC) and printed on the sheets 20, 40. A cover section 80 is prepared from a booklet cover sheet 41 and a booklet cover core 71, while the page sheet 20 is bent to prepare a page section. Both the cover section and page section are then united, and the strap 10 is further mounted to prepare the booklet 310 with the strap. The box 320 is prepared from a box cover sheet 42 and a box core 72. The booklet 310 with the strap is stored from an opening 321 of the box 320.