Yūki Iwai portrays a fictionalized version of himself in the film. He comprises one half of the comedy duo Haraichi alongside Yū Sawabe, and both appear as themselves within the movie. Iwai provides the voice for his own character in this narrative context. The film does not develop a distinct background story, character arc, or narrative progression specifically for Yūki Iwai as a fictional entity separate from his real-life persona.