Deep sleep りを means する "ノンレムsleep". This work is a dream, a present, a present, a non-present, and a dream.ような世界観を影出す「ノンレムの窓」シリーズ4th chapter. The third part of the story consists of the main work, the original work, and the appearance of the insider of the case, Yuki Saito, and the appearance of Saito Yuki, the mystery of the female character, and the appearance of the voice.