Nichiren Buddhism understands rebirth as the ongoing continuity of life shaped by karma, without positing an eternal, unchanging soul. What carries over from one existence to another is a karmic stream: the accumulated causes created through thoughts, words, and actions. This continuity unfolds across what are called the Ten Worlds—hell, hunger, animality, anger, humanity, heaven, learning, realization, bodhisattva, and Buddhahood—which are seen not as fixed realms but as dynamic states of life. Rebirth, in this view, is not limited to a single transition at death; it is also a moment‑to‑moment process in which one’s life condition is constantly being “reborn” in response to causes made in the present.

Within this framework, faith in the Lotus Sutra and the practice of chanting Nam‑myōhō‑renge‑kyō are regarded as the decisive means for transforming the direction of this karmic continuum. By aligning with what is called the Mystic Law, practitioners are said to tap into their inherent Buddha nature and elevate their life condition, thereby influencing both their present experience and future rebirths. The cycle of rebirth, understood as an ongoing process driven by cause and effect, becomes less a prison of suffering and more a field in which negative karmic patterns can be broken and positive causes established.

A distinctive emphasis of Nichiren Buddhism is the possibility of attaining Buddhahood “in this lifetime, in this body,” rather than postponing liberation to some distant future existence. Realizing Buddhahood here and now is said to change the quality of all subsequent lives, because one’s fundamental life state has been transformed. From this standpoint, future rebirths are not necessarily seen as burdensome returns to suffering, but can be understood as opportunities to act from a Buddha state, working for the awakening and happiness of others. Thus, rebirth is affirmed, yet the spiritual focus is placed squarely on transforming life in the present through faith in the Lotus Sutra and dedicated practice.