It is believed that Kaijo inherited the will of his two masters' commitment to copying Daihannya-kyo (Great Perfection of Wisdom Sutra) and completed the work in six years with the divine protection of Hachiman Daibosatsu (Great Bodhisattva Hachiman).
両師の発願した大般若経書写の遺志を継ぎ、八幡大菩薩の加護を受けて6年の歳月をかけて完成させたという。