Ryōta is a new company employee navigating personal relationships within wintry conditions. He shares a romantic relationship with Yuki, forming one of the central couples in the narrative. Their storyline converges with two other relationship dynamics—a father-daughter pair and two coworkers—during a town's annual riverside light show event set against snowfall. The emotional developments of these characters, including Ryōta and Yuki, intertwine as they prepare for and experience the luminous display. Snowfall shapes both the visual atmosphere and the characters' interactions throughout.