"Rascal Does Not Dream of Santa Claus" is a one-hour special that continues the narrative of the "Rascal Does Not Dream" series, based on the light novels by Hajime Kamoshida. The story takes place during the winter season, focusing on Sakuta Azusagawa, a high school student, and his girlfriend, Mai Sakurajima, a popular actress. The special explores themes of adolescence, relationships, and the supernatural phenomena tied to the series' central concept of "Adolescence Syndrome."

The plot begins with Mai preparing for a Christmas Eve event where she is set to play the role of Santa Claus. Sakuta, supportive as always, accompanies her, but their plans are disrupted when Mai suddenly disappears. This disappearance is linked to the mysterious Adolescence Syndrome, a recurring element in the series that manifests as inexplicable events affecting teenagers. Sakuta discovers that Mai has become invisible to everyone except him, a phenomenon that mirrors the struggles of another character, Shoko Makinohara, who has previously experienced similar issues.

As Sakuta investigates, he learns that Mai's invisibility is tied to her feelings of insecurity and the pressure of her public persona. Her fear of being forgotten or overshadowed by her career has triggered the syndrome. The narrative delves into Mai's internal conflict, highlighting her vulnerability beneath her confident exterior. Sakuta, determined to help, works to understand the root cause of her condition and find a way to make her visible again.

The story also revisits Shoko Makinohara, whose presence adds complexity to the plot. Shoko, who suffers from a heart condition, has a mysterious connection to Sakuta and Mai, and her involvement in the events of the special underscores the series' exploration of fate and interconnectedness. The interplay between the characters' emotions and the supernatural elements drives the narrative forward, culminating in a heartfelt resolution that reaffirms the bond between Sakuta and Mai.

The special maintains the series' signature blend of emotional depth, character-driven storytelling, and subtle supernatural intrigue. It expands on the established dynamics between Sakuta and Mai while introducing new layers to their relationship. The winter setting and Christmas theme add a poignant backdrop to the story, emphasizing themes of love, self-discovery, and the challenges of growing up.