There are reports that English text typed with unreadable fonts is more memorable than that with readable fonts. The purpose of the textbook is to reinforce the reader’s understanding. Therefore, the unreadable fonts can be better than readable ones. We investigated the effect of font type on the memory and comprehension of typed text in Japanese. We found that the comprehension is better when unreadable font types are applied except that the text was written only in Chinese characters. Our finding can be applied for various educational scene.