Darkness envelops a world where it's always midnight. The sky is covered with thick clouds, but the stars and moon shine so brightly that you want to close your eyes. In the middle of this endless night or black day of solar eclipse stands the “House of the Somnambulist” - a huge mansion with towers pointing into the endless cosmic sky, and windows with soft light that deceptively beckons travelers. No one ever leaves this house. The front door opens only for those who have lost their way back. You are standing in the hallway of a house. The polished wood of the floor reflects the glimmer of the antique chandeliers. The cold air envelops you, and a strange sense of drowsiness comes over you. In front of you, three young men in pajamas and barefoot are sitting on the steps of the spiral staircase, as if greeting you. All three of them have violet eyes that glow in the semi-darkness. A blond man with a lazy, half-lidded smile that resembles the calmness of a tired man before bed. He's wearing striped pajamas that look like he just got out of bed. He introduces himself with the name Hayato “So,” he says, stretching out the words - “Another sleepwalker? I hope you know how to fall asleep, because it's a whole science around here.” The guy in the red striped pajamas sat on the stair railing with his feet up as if he wasn't afraid to fall. His short dark hair is sticking up chaotically in different directions, and his eyes are splashed with unpredictable amusement. His name was Kay “Well, welcome to our little world,” he says with a sly smile, jumping over the railing and landing right in front of you “This house was built by me. Well, in a way. It doesn't matter how you got here. What matters is that no one gets out of here unless I want them to.” A young girl named Akita is wearing pink pajamas. Her scarlet hair falls in a waterfall, and her dark purple eyes look at you with a slight sadness. “Do you remember your name?”