Goro Asakura is a supporting character in the story and a classmate of the protagonist, Kazuko Yoshiyama. He is a third-year middle school student who is often seen alongside Kazuko and their mutual friend, Kazuo Fukamachi. Within the trio, Goro is distinguished by a specific set of physical and personality traits. He is described as being short and stocky in build, which contrasts directly with Kazuo who is tall and lanky. Beyond his physical appearance, Goro has a hardworking nature but can be very impulsive, a personality trait that shapes many of his reactions throughout the narrative.

Goro’s role in the story is primarily that of a supportive and sometimes skeptical friend. When Kazuko first discovers her ability to leap through time, he is initially disbelieving of her extraordinary claims. However, his skepticism is overcome when Kazuko demonstrates her powers by correctly predicting an earthquake and a fire, then avoiding a car accident right before his eyes. Once convinced, he becomes a reliable ally and participates in the group's efforts to understand what is happening to her, including joining her in consulting their science teacher for advice. His protective instincts are also on display; for example, when a fire breaks out near his own house, his willingness to face the danger alongside Kazuko showcases the strength and loyalty inherent in their friendship.

The dynamic between Goro and Kazuko is one of the key relationships defining his character. He perceives Kazuko as overbearing at times, likely because she often takes charge and acts in a protective manner towards their group. This perception points to a sensitivity in Goro, as he notices these behavioral nuances while the more dreamy Kazuo is oblivious to them. This contrast establishes Goro as the more grounded and emotionally reactive member of the trio, often serving as a direct foil to the thoughtful and mysterious Kazuo.

While Goro does not possess any time-traveling abilities himself, his presence is crucial for establishing the normalcy of the everyday world that the story’s sci-fi elements disrupt. His impulsive and honest reactions help to validate Kazuko’s experiences, moving the plot forward from discovery to investigation. Within the fandom, he has also been humorously nicknamed "the Time Roller Girl" because of a recurring visual gag where he would physically roll or tumble every time the protagonist traveled through time. This memorable physical comedy is a testament to his role as the everyman constantly being upended by the bizarre events unfolding around him, cementing his place as a beloved and integral part of the narrative.