Sophie, a curious and healthy eleven-year-old girl, is confined to a hospital bed under her mother’s constant watch. When she meets Buck, a cheerful nine-year-old adventurer, they embark on a journey of self-discovery and movement. As they explore together, Sophie begins to question the reality of her situation, wondering if she is truly as unwell as her mother insists.

Three people tormented by relentless anxiety and prolonged sleeplessness, slowly lose their human forms. As their condition worsens, they evolve into monsters, doomed to an eternity without rest.

After separating heaven and earth, Tengri, the all-embracing God of heaven in the traditional Turkic, Yeniseian, and Mongolian beliefs, divided himself into man and woman to procreate. He named the woman the goddess Umai and settled her atop Mount Sumeru in the sky, near a milk lake called Sutkol. Here begins the story of Umai – the ancestor and spirit of women – on the vast steppes of the nomadic lands.