Some people may think author's name is 'Hideyoshi'. To read kanji '秀吉' as 'Hideyoshi' is more well known, because it's same as a very famous person '豊臣秀吉(Toyotomi Hideyoshi)' in Japanese history.
This author's name is 'Ibu Hidekichi' actually, not 'Hideyoshi'. Name is written so, at the cover (see image #001).