By the late Kamakura period, Toimaru functioned not only as subordinates to the landlords who owned the ports, but also as agents which managed the transports of nengumai as to meet the demands of other manor owners who used the ports.
鎌倉時代末になると問丸は、港湾を所有する領主に隷属して仕事をするだけではなく、その港湾を利用する他の領主の要求にも応じ、年貢米の輸送管理を引き受けた。