Myoho renge kyo is the life of the Original Buddha

"Further, the Law of the Lotus Flower of the Sublime Dharma is the unchanging law which has existed in all its fullness from the beginningless beginning, the beginningless Most Distant Past. In other words, we may call it the Life of the Original Buddha of the Most Distant Past." -- The Tradition of Nichiren Doctrine by Tetsujo Kubota