Kokuzo Meditation

From a long ago dialogue on ARBN

The 21-day meditation on Kokuzo, known in Japanese as the "gumonji Ho", an esoteric ritual for strengthening the powers of memory that centered on the repeated invocation of Bodhisattva Kokuzo's name. This is the format that Nichiren used when he prayed to Kokuzo Bosatsu and received the "jewel of wisdom". ( Kokuzo wears a jewel in his topknot. His name means Wisdom Expansive as Space, i.e. filling the entire cosmos). Nichiren was only 15 years old, and the ritual was an esoteric (shingon) one (this was before he advocated chanting the daimoku in 1253)

...apparently the promise is to have a kind of "out of body experience" and to inhabit the body of Kokuzo (i.e. leave the human body, which is blighted by the five senses, which only perceives illusions.) This also is the ritual that Toda's enlightenment in prison is based on. The "Kokuzo meditation" is well known enough among Orientals so that Toda could use a similar analogy to give credibility to his vision.