As his family went on a trip abroad, Kohei Shinoda was going to spend the night alone. Unexpectedly, someone came to visit him.

Akio Tamiya.

He and Shinoda were once in a relationship, while being a student and his tutor. In addition to that, Akio was the younger brother of Shinoda's wife. Why did Akio, who had been missing twenty years ago, come back to see him now that she had left?

Although Shinoda could not hide his confusion, he welcomes Akio and they go play together in the snow, but he gradually starts to feel uncomfortable. Akio's behavior was completely incomprehensible.

Shinoda was continuously tormented by this thought, and at the end…