In 1916, Ernest, an 18-year-old sapper soldier, has to dig a tunnel ten meters underground to place dynamite in a strategic position. But the Germans are digging too, and they are so close that you can hear their voices...

Each one in their apartment, Mitsuko and Daisuke remember.

I am like a pendulum that can’t stop waving, always moving, never reaching.

When effort leads to trance.