On the 28th day of the fourth lunar month in 1253 by our common reckoning the Japanese Buddhist monk Nichiren had his realization that the Lotus Sutra was the epitome of all Buddhist teachings and that calling upon the title of the Sutra alone can bring about liberation.
A major school of Japanese Buddhism today with numerous sub schools, thanks to the ministrations of the particularly aggressive evangelism of the lay Soka Gakkai in the 1970s this would be the first form of Buddhism to which many young Americans would be introduced.
The large majority of those following in this school are characterized by devotion to a mantra derived from the title of the Sutra, Nam Myoho REnge Kyo.