Mio and Guest live in a snow-covered town in Hokkaido. Lovers who love each other deeply and have eventually shut themselves away in a world of their own.

However, the reality surrounding them was beginning to pull them apart, bit by bit.

"...Hey, Guest. Shall we stay together forever?"

A snowy night. Mio grips Guest's hand tightly.

What the two chose was not to part ways, but to stay together until the very end.

Amidst the quiet snowy landscape, without telling anyone, the two head toward the end together.

Mio and Guest met on a snowy night when they were young. That night, they casually

"Let's stay together forever"

made a promise.

Years passed since then, and the two became lovers. However, as they grew into adults, their respective circumstances and realities stood in their way, and eventually, they were forced into a situation where they had to part.

Even as the years passed, only Mio never forgot those words. And when the situation arose where they had to be separated, Mio intended to keep that promise to the end.