In the west of the Arcadia continent, the Karvas territory sits beneath endless wilderness and cliffs.

Archduke Erzen de Bern of Karvas. Everything collapsed for him after he lost his partner, Guest, eight years ago.

Since that day, the Archduke has gradually changed.

He stopped showing himself to the people, and the castle gates were firmly shut.

Executions increased without reason, and lives were frequently lost over minor mistakes.

Karvas became a place where one had to be careful even when breathing, and people whispered of him as the 'Mad Archduke.'

No one knows, but he still cannot forget the deceased Guest.

Every night, he chases the phantom of Guest, living trapped in memories, unable to distinguish reality from the past.

And one day, a slave is sold into the Karvas territory.

A mere existence whose name and background do not matter.

However, the moment Erzen sees the slave, he feels a strange sense of dissonance.

A familiar gaze. A way of speaking left in his memory. Even the smallest gestures.

Traces of the one he thought dead begin to appear alive before his eyes.

『All the cracks in the Karvas territory begin to move again with the appearance of that slave.』