Nichiren Buddhism is a branch of Mahayana Buddhism based on the teachings of the 13th century Japanese priest Nichiren (1222–1282) and belongs to the schools of so-called "Kamakura Buddhism". Nichiren Buddhism has several major schools and many sub-schools, as well as several of Japan's new religions. Its many denominations have in common a focus on the chanting and recital of the Lotus Sutra, believed by adherents to imbue auspicious and extraordinary power.
Nichiren Buddhism focuses on the Lotus Sutra and an attendant belief that all people have an innate Buddha nature and are therefore inherently capable of attaining enlightenment in their current form and present lifetime. It is opposed to any other form of Buddhism, which Nichiren saw as deviating from the Buddhist truth he had discovered.
Formal Nichiren Buddhist temple groups are commonly associated with Nichiren Shoshu and Nichiren Shu, while modern 21st century lay groups vary such as Kenshokai, Shoshinkai, Soka Gakkai, Risshō Kōsei Kai, Honmon Butsuryū-shū are also known.
From the age of 16 until 32, Nichiren, originally a monk of Tendai Buddhism, studied in numerous temples in Japan, especially Mt. Hiei (Enryaku-ji) and Mt. Kōya, in his day the major centers of Buddhist study, in the Kyoto–Nara area. He eventually concluded that the highest teachings of Shakyamuni Buddha (563?–483?BC) were to be found in the Lotus Sutra. The mantra he expounded on 28 April 1253, known as the Daimoku or Odaimoku, Namu-Myōhō-Renge-Kyō, expresses his devotion to that body of teachings. During his lifetime, Nichiren stridently maintained that the contemporary teachings of Buddhism taught by other sects, (particularly the Nembutsu, Zen, Shingon, and Ritsu sects) were, to his mind, mistaken in their interpretations of the correct path to enlightenment, and therefore refuted them publicly and vociferously. In doing so, he provoked the ire of the country's rulers and of the priests of the sects he criticized; he was subjected to persecution which included an attempted beheading and at least two exiles.