According to Article 51 of "Koyo Gunkan" (record of the military exploits of the Takeda family), on April 12, 1575 (in old lunar calendar, which was May 31, 1575 in Gregorian calender), just before the Battle of Nagashino, Shingen's funeral ceremony was perfomed, and Kaisen Joki served as Daidoshi (who chants the prayers and essence of religious texts and leads the whole ceremony in Shuni-e (Omizutori, Water-Drawing Festival)) at the funeral ceremony.
葬儀は、『甲陽軍鑑』品51によれば長篠の戦いの直前にあたる天正3年（1575年）4月12日に恵林寺で弔いが行われており、快川紹喜が大導師を務め葬儀を行ったという。