This book explores the Nichiren calligraphic mandala starting from the historical and artistic context of medieval Japan in a broader and objective framework than the purely sectarian narrative and indeed, mainly as a work of art. The author was able to directly analyze a large part of Nichiren's original extant mandalic corpus and visited all the places where they are preserved, directly interviewing the curators and experts in this field. The book also stems from his research carried out at Rissho University, adapted to a wider audience and not necessarily Nichiren devotees.