Asami Keisai was a Neo-Confucian scholar in the early Edo period. His given name was Yasumasa. His common name was Jūjirō. His other pen name was Bōnanrō. He was from Ōmi. He was one of the three great disciples of Yamazaki Ansai, and advocated for the ideology of reverence for the Emperor. He opened a private school in Kyoto and never served any feudal lords throughout his life. His work, "Seiken Igen," strongly influenced the loyalists at the end of the Edo period. Other works include "Chūgoku Ben," etc. Asami was a disciple of Yamazaki Ansai, but was excommunicated because he did not agree with Ansai's Shinto theories. However, he was one of the three great disciples who most faithfully inherited and developed his master's scholarship. This book traces Keisai's life as a biography, and further investigates his scholarship and his essence as a scholar, clarifying many of the conventional doubts. A detailed chronology and index are included. With signature and inscription. Kondo Keigo was born in 1921 and died in 2017. He was from Shizuoka Prefecture. He graduated from the Daito Bunka Gakuin High School. He was a Confucian scholar. He held positions such as professor at Kanazawa Institute of Technology. His edited and co-authored works include "A Study of Asami Keisai," "A Study of Yamazaki Ansai," "Confucian Funeral and Shinto Funeral," and "Yoshida Shoin and Seiken Igen," among many others.