Ingō died in 1281 and his top disciple took over the teaching position at Kōzuke Chōrakuji, but he died a year later in 1282. Shinkai took over and served as head priest of Kōzuke Chōrakuji for twenty years. Shinkai and Kōhō Kennichi 高峯顯日, who at the time was based at Unganji 雲巖寺 in the neighboring province of Shimotsuke 下野 (present-day Tochigi prefecture), were known in the Kantō 關東 area as 'the two gates of nectar' (ni kanromon 二甘露門), an epithet of praise for their sublime ability to preach the dharma. Shinkai became head priest of Tōfukuji in 1307. He died in 1308 (Engyō 延慶 1.6.26) at the age of 78. His posthumous title is Hōshō Zenji 法照禪師.