Book I introduces the following episodes: the so-called 'sankan-seibatsu' (the conquest of three countries in old Korea) by Empress Jingu; the achievements of Emperor Ojin, the son of Empress Jingu, who was regarded as Hachiman Daibosatsu (Great Bodhisattva Hachiman); and the attacks of Mongol army, invasions into Tsushima and Iki Provinces, Mongol army's landing on Kushyu island, battle between Mongol army and Kyushu warriors, and the burning of Hakozaki Hachiman-gu Shrine during the Bunei War.
上巻においては神功皇后のいわゆる「三韓征伐」、皇后の皇子であり八幡大菩薩とされる応神天皇の事蹟、元寇文永の役における蒙古軍の襲来、対馬・壱岐への侵攻、九州上陸と九州御家人勢との戦闘の状況、箱崎八幡宮（筥崎八幡宮）の焼亡などが記される。