Then, he started negotiations with the Ming Dynasty, however the diplomatic relationship between Japan and Ming was not established at that time due to "the Koiyo no goku" (the incident in which Koiyo was executed on the suspicion of espionage) broke out in the Ming in 1380.
対明交渉を開始するが、1380年には明で胡惟庸の獄が起り、胡惟庸が通牒している疑惑などがあり、日明関係は成立しなかった。