Taeko Hiramatsu attends school alongside Ayumu Aikawa, her brown hair typically styled in pigtails while she wears her standard uniform. She ranks as an honor student, achieving the highest grades in her year. Kind, friendly, and caring by nature, she remains notably shy and reserved, often feeling uneasy during social interactions. Taeko harbors a long-term romantic interest in Ayumu but struggles to express it openly, as shown when she prepares a bento for him yet cannot deliver it. Her concern for him surfaces when she defends Ayumu against classmates labeling him the "chainsaw hentai-boy" during a graveyard incident. Her feelings originate from their first meeting on a rainy day, where she witnessed Ayumu offering his umbrella to a stranded cat. Moved by his kindness, she gave her own umbrella to him, cementing her admiration. Outside academics, Taeko excels at Hyakunin Isshu and enjoys reading. She dislikes ghosts, horror movies, and holds a specific aversion to zombies. Within the narrative, she maintains a secondary role, interacting primarily with Ayumu and their friend group: Yuki Yoshida, Kanami Mihara, Tulio Orito, and Shimomura. Her presence includes incidents like Ayumu rescuing her from a Squid Megalo at school, but these events do not drive personal growth or expand her backstory beyond the school setting.