Kawashima Masayuki is a successful graphic designer living in Tokyo with his loving wife, Yoko, and their healthy baby girl. Outwardly, their lives are a picture of happiness and contentment.
Every night, however, unable to sleep, Kawashima creeps from his bed and watches over the baby's crib while his wife sleeps. But this is no ordinary domestic scene, for on each of those nights, as he stands gazing at his newborn child, Kawashima has an ice-pick in his hand, and an almost visceral desire to use it. One particular night, as this drama unfolds once more, Kawashima makes a decision to confront his demons, and sets into motion an uncontrollable chain of events seeming to lead inexorably to murder ...