im trying to  get all of female  grey's CGs, im already inside lady akiras  dungeon to get pearls but ive been doing that for a while and nothing has happened, i got like 10 of each and theres not even a quest like in other adventures. Am i missing something or am i bugged? The walkthrough doesnt mention anything

One chest in the dungeon has a special item, which is requires to unlock a new dialog with Grey in the castle in Aldlyn, which leads to the CG scene.