ILLIT's Japan second single tells the story of girls who continue to grow while facing their worries, conveying the group's genuine emotions and narrative. It is scheduled to contain three songs, including "Sunday Morning," released digitally in January 2026 and used as the opening theme for the TV anime "Tis Time for 'Torture,' Princess." The Limited Edition comes with 12 postcards, a multi marker, a selfie photo card (randomly selected from five kinds / W55 x H85mm), and a unit selfie photo card (randomly selected from five kinds / W55 x H85mm).