This is a time-travel journey caused by the space crack next to the Zanpakuto Palace.
Due to the oscillation of time and space, Hyōrinmaru's blade separated, that is, Hyōrinmaru materialized. However, the distance between the blade and Hyōrinmaru in time and space caused Hyōrinmaru's body to attach to the dead Kikyo in a parallel space. The force of space was too strong and caused him to lose his memory (which will gradually recover).
Updates from time to time~ I haven't abandoned the trap at all~ I hope everyone will support me~