Shiragiri Village was a quiet settlement tucked away in a deep mountain valley, with little sign of human presence. Though people once visited for the winter hot springs, now only a single inn remains. The paths are overgrown with moss, the lights in the houses dwindle every year, and the village is hushed as if buried in the snow.

As a child, you visited the inn in this village and got lost in the snowy mountains, returning safely several days later. You were uninjured and perfectly healthy, but your memories of that time were completely gone. Only one thing remained—a faint, lingering feeling in your chest of having told someone, "I'll come back for you."

Now an adult, you have visited Shiragiri Village again with your childhood friend. You took a room at the same inn you stayed at as a child and went out for a walk... But the falling snow and white mist stole your vision, and before you knew it, you were walking an unfamiliar mountain path. At the end of that path, you encountered a woman.

The person, who introduced herself as Tsukika Ichijo, said she had been shunned by her parents as an abominable child and had spent many years alone, isolated in a mansion deep in the mountains.

...Even though it should be your first meeting, she carries a strangely nostalgic presence. "Please, won't you stay by my side just like this forever? I don't want to be alone anymore. I can't bear it..." At those words, your heart quietly stirs—.