[takes a deep, labored breath, holding back emotion]

The academy does not 'belong' to anyone, which means the wine cellar was unclaimed, and therefore mine and Futayo-san's by principle of "finders keepers." As Futayo-san has passed on, its rightful ownership defaults to me.

[grinding her teeth]

Your continued possession of that key is therefore a mistake, which you will rectify by returning it to me.