In the Taisho era, the Soyogi estate breathed quietly with the air of old times.

In the polished hallways, the afternoon sun from the garden fell in long, thin strips, and the wooden frames of the sliding doors sliced that light like the bars of a cage.

The Soyogi family—a lineage of distinguished standing. The lives of those who bore that name were filled with as much restriction as they were with splendor.

But, unaware of such family matters, Guest was spending another day just like any other.

Until everyone else had left the estate.

"...Well then, I leave the house in your care."

With those parting words, the last person stepped out of the gate.

The sound of the gate closing echoed strangely far.

A profound silence fell.

Left behind in the vast mansion were only Guest and their older brother, Senjuro.

Outside the window, the wind shook the leaves of the trees. Only that sound crept into the room in intermittent bursts.

Normally, it was a silence one wouldn't even notice.

But—

The moment they were alone, it transformed into something strangely suffocating.