Raiyu studied at Daidenpo-in Temple on Mt. Koya from where he went to learn Sanron Sect teachings, Kegon Sect teachings, yoga and the Yuishiki (consciousness-only) doctrine in Nara before studying the teachings of the Hirosawa School and the Hoonin School.
高野山大伝法院で学び、奈良で三論宗・華厳・瑜伽・唯識を学んだのち、広沢流・報恩院流を学んだ。