According to Akyū, Yoshika has been spotted without her amulet before, and it seems some semblance of the original Yoshika would surface, composing poetry in a daze.
Maybe Kasen does know. And she occasionally stops by the graveyard to remove the amulet and recite some poetry with Yoshika for old times' sake. Or she's been casting her own spells into Yoshika, slowly rebuilding her friend when not controlled.
