First volume of Rokka no Yūsha (六花の勇者) a series of light novels written by Ishio Yamagata. The title of this first volume is Don't pray to the Flower.
This series of light novels are about 6 heroes who have ben chosen by the Gods to kill a Demon, but when they gather, they will realize that there might be an impostor among them.
This book contains furigana in the most advanced kanjis. It is a suitable reading for N3 or above students.
Even though this book contains some illustrations it is not a manga comic.