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Books about Ryoichiro:
Kaikakuki no Minji tetsuzukiho: Harai Ryoichiro Sensei koki shukuga (Japanese Edition) (2000)
Meiji Nichi-Bei boeki kotohajime: Jikayu no shishi Arai Ryoichiro to sono jidai (Homei sensho) (Japanese Edition... by Yasuo Sakata (1996)
Wiki information Ryoichiro:
Ryoichiro Matsuo is a film producer.
Ryoichiro Yonekura is an actor.