Mansai served as the twenty-fifth monzeki (head priest of the temple, formerly led by the sect founder) of the Sanboin Temple, and also held the post of seventy-fourth zasu (temple head priest) of Daigo-ji Temple from 1395 to 1434, creating a precedent for the monzeki of Sanboin Temple concurrently holding the post of zasu of Daigo-ji Temple.