冊子

1. noun book; booklet; story book; pamphlet; notebook

そうし also 草紙 · 草子 · 双紙

1. noun written work (esp. a bound text, as opposed to a scroll)
2. a text written entirely in kana
3. graphic novel (esp. one created between the 12th and 19th centuries)
4. notebook (for practicing kana, drawing pictures, etc.)
5. rough draft