When Rokuhara Tandai (an administrative and judicial agency in Rokuhara, Kyoto) failed to properly handle the intrusion into the Imperial Palace by the monk-soldiers of Enryaku-ji Temple, Nagakage was sent to Kyoto together with Yukitada NIKAIDO as a Toshi (messenger from the Kamakura Shogunate to the Imperial Court in Kyoto) to deal with the failure, met with Kanto Moshitsugi (court-appointed liaison with the Kamakura Shogunate) and requested remission of Kamakura samurai for the reason that they were fully occupied with handling of the Yuan Dynasty.
弘安6年（1283年）の延暦寺衆徒らによる禁中乱入事件で六波羅探題が対処できなかった事で、二階堂行忠と共に東使として上洛し、関東申次に面会して鎌倉武士は元(王朝)への対処で手一杯として赦免を求め、失策の処理にあたった。