Wikipedia
Reiyūkai
, or Reiyūkai Shakaden, is a Japanese Buddhist new religious movement founded in 1925 by Kakutarō Kubo (1892-1944) and Kimi Kotani (1901-1971). It is a lay organization (there are no priests) associated with Nichiren Buddhism.
Reiyūkai considers itself the grandfather of lay-based new religions devoted to the Lotus Sutra and ancestor veneration.
Reiyūkai membership currently stands at 5.14 million members, with the majority living in Japan.