花沢健吾 has written at least 19 books. Their most popular book is アイアムアヒーロー with 3 saves with an average rating of 4⭐.
Series
6 primary books7 released booksI Am a Hero is a 15-book series with 6 primary works first released in 2009 with contributions by Kengo Hanazawa, 花沢健吾, and Nadja Stutterheim.
Series
1 primary bookRessentiment is a 1-book series first released in 2004 with contributions by 花沢健吾.
Series
5 primary booksアンダーニンジャ [Under Ninja] is a 5-book series with 5 primary works first released in 2019 with contributions by Kengo Hanazawa, 花沢健吾, and Marc Bernabé.