As for the Shinto ritual, I believe you are correct. Again to cite a foreign example, I suppose it is analogous to Pope Emeritus Benedict's resignation. Pope Francis became, according to Roman Catholic theology, Christ's Vicar on Earth even though His previous vicar is still living.
: --Previous Message--
: The expectation is apparently that the
: will abdicate in favor of the Crown Prince
: at the end of 2018.
: Strange to have a one time law.
: I wonder how the Coronation of the next
: Emperor will be effected when there is a
: living former Emperor. Isn't it a part of
: the ritual that the Emperor enters a special
: tent or building, where he puts on the
: Imperial costume and the goddess Amaterasu
: takes her residence in the Emperor. (This is
: a Shinto ritual.)