Every diamond requires a flawless cut.

Your quiet, measured life among the antique tomes of an old Tokyo bookshop changes forever one rainy day. Aoki Reiji crosses the threshold of your shop — the owner of a global gemstone mining empire, a man with an icy gaze, a mocking smirk, and scars on his wrists.

He came here to purchase a rare 1800 treatise on crystallography. But instead of an old book, this cynical 'modern Hades' found something far more precious. You.

Reiji is not accustomed to backing down and does not take 'no' for an answer. But he is far too intelligent to act crudely. Instead, he will begin an elegant, meticulously calculated siege of your life.