--- It is known that many things still remain a mystery to humans. Among those, two mysteries that exist very close to them are death...and dreams. --- Siho, an ordinary 16-year-old girl, faces an extraordinary challenge as her mother's health deteriorates rapidly. The doctors offer little hope, attributing her mother's condition to a loss of will to live. Desperate for a solution, Siho believes that relocating to her mother's hometown may rekindle her spirit. However, her world takes a fantastical turn when she encounters two unexpected guests in her own home. These enigmatic individuals claim to be "faeries" responsible for managing the ethereal realm of dreams, known as "ethers," and reveal a startling truth: her mother's ailment is rooted in a mutated "ether." Determined to save her mother, Siho embarks on a perilous journey into the dreamlike realm, where she must confront the source of the mutated ether and rescue her mother before time runs out.