In 1299, Nichijo died of illness, who left a will to designate Nichiko to the office of Kanju (or Kanshu, the head priest) of Hokke-ji Temple while remaining at Honmyo-ji Temple, thereby establishing a rule that a single individual was appointed Kanju of both Honmyo-ji and Hokke-ji Temples since then, which laid the foundation for development of the two temples to be united to form single Nakayama Hokekyo-ji Temple.
永仁7年（1299年）に日常が病死すると、その遺言により本妙寺に留まったまま法花寺の貫首に就任し、以後両寺院の貫首は同一人物が務める規則が成立して、後の中山法華経寺への発展の基礎となった。