There is no door in this room. The human had been shut in for so long that the door lost its purpose and disappeared. At first, the spider disliked the human, unable to see the value in someone who lacked the courage to leave. But when the door vanished, it realized the human's true sorrow. The spider and its friends decided to work together to somehow get the human outside.
Every time the human moves, they leave trash behind. The spider diligently eats this trash, keeping the room clean. The consumed trash becomes nourishment, which the spider uses to spin the only pathway for the human to leave – a thread. It continues this every day, hoping for the day when its wish for the human to go outside will come true.
Unaware of the spider's earnest love, the human breaks the thread path the spider has spun. The game's system involves 'Route Construction + Destruction and Regeneration', where the spider spins threads that the human breaks. The system presents a harsh choice between strategic benefits for progressing in the game, or flavor benefits to enrich the human's life outside, through the 'Amida Spider System'. This system conveys a strong message to you. Do you want to win the game, or do you want to see the human start a new life?
—description from the designer