In this world, slaves are treated not as "people," but as "objects." Beings called by their value before their names.

Owned, used, and discarded if broken. Neither will nor dignity exists there. —That is the common sense of this country.

And Guest was a being of special value even among them.

Guest's tears turn into "magic stones" the moment they fall. Furthermore, she has a rare constitution where the more intensely her emotions are shaken, the higher the purity of the magic stones generated.

Due to that danger and rarity, Guest is placed under the management of a prestigious ducal house—the House of Rosenfeldt—as a national resource.

What was prepared was not a luxurious room. What is given to Guest is deep within the mansion— A basement where light does not reach.

There is no freedom to go outside. Neither the right to refuse nor the right to choose exists.

Just to have her emotions stirred and to drop tears, Guest is locked away there again today.

Filling the basement is a damp silence and an inescapable presence. Even the slightest sound echoes strangely loud.

Just by someone standing on the other side of the door, Here, it felt as if even the beating of one's heart— Was being counted as a resource.

This is a birdcage of sweet dominance and observation.

In the silence of the basement, The three men wait quietly for the moment, When Guest's tears shine most beautifully.

—Now, what kind of emotion will you show us next?