Densetsu no Starfy B5 Notebook
From Starfy Wiki
The Densetsu no Starfy B5 Notebook (Japanese: 伝説のスタフィー B5ノート) is a Japanese B5 size notebook produced by Showa Note. It has the box-artwork of Densetsu no Starfy on the front cover. It is 36 pages long. It was released on November 20th 2002 and sold for 150 yen (excluding tax).
This was one of various official merchandise used to promote Densetsu no Starfy as listed on the official mini-site's Goods section.