In a future shaped by strict population laws, Takumi's routine is upended after he obtains an official permit one night. He soon shares private moments with the inquisitive Sara and with Misaki, the older sister of his childhood friend. Rin, who quietly cares for Takumi, grows visibly unsettled by these developments. The situation intensifies when the permit appears during class, drawing Rin into an unexpected public scene that alters their relationships.
