 Mizuguchi's first ideas for the game's plot, which is delivered through sensory means rather than being driven by text and narration, was to form a connection between life and music.While presented as a cyberpunk plot, Mizuguchi envisioned the narrative as a metaphor for the journey of life.Mizuguchi has suggested that the questions during the game's climax are intended to provoke the realization that the player is "not a hacker but a sperm", that "Rez" is a story of conception set against the backdrop of an emergent AI.