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He graduated in [[1906]] and returned to Naha, where he began to compose one essay after another on Okinawa-related subjects, joining the vanguard in Okinawan Studies. In [[1910]], he was named the first director of the Okinawa Prefectural Library; in addition to overseeing the collection of documents and other materials, he traveled around the islands giving more than 300 lectures.

He graduated in [[1906]] and returned to Naha, where he began to compose one essay after another on Okinawa-related subjects, joining the vanguard in Okinawan Studies. In [[1910]], he was named the first director of the Okinawa Prefectural Library; in addition to overseeing the collection of documents and other materials, he traveled around the islands giving more than 300 lectures.

Ifa published his first book, ''Ko-Ryûkyû'' ("Old Ryukyu"), in [[1911]], collecting up many of his earlier essays. From that time forward, he engaged with fellow Okinawa Studies scholars [[Majikina Anko|Majikina Ankô]], [[Higashionna Kanjun]], and others, pioneering the field.

Ifa published his first book, ''Ko-Ryûkyû'' ("Old Ryukyu"), in [[1911]], collecting up many of his earlier essays. From that time forward, he engaged with fellow Okinawa Studies scholars [[Majikina Anko|Majikina Ankô]], [[Higaonna Kanjun]], and others, pioneering the field.

Ifa wrote in his essay ''Ryûkyû jinshu ron'' ("On the Race/Ethnicity of Ryukyu") in 1910 or 1911 that the Ryukyuans were of the same race or ethnicity (J: ''jinshu'') as the Japanese, and that for today's Ryukyuans, quick assimilation (J: ''dôka'') with the Japanese was the best path.

Ifa wrote in his essay ''Ryûkyû jinshu ron'' ("On the Race/Ethnicity of Ryukyu") in 1910 or 1911 that the Ryukyuans were of the same race or ethnicity (J: ''jinshu'') as the Japanese, and that for today's Ryukyuans, quick assimilation (J: ''dôka'') with the Japanese was the best path.