Taeko Hiramatsu is Ayumu Aikawa's classmate and a member of his social circle. She sports brown hair, usually styled in pigtails, and is most often seen in her school uniform. Kind, friendly, and caring by nature, Taeko displays pronounced shyness concerning her romantic feelings for Ayumu. This hesitation prevented her from giving him an obento she prepared. Later, she actively defended Ayumu against classmates labeling him the "chainsaw hentai-boy" disrupting the school graveyard. Her affection stems from witnessing Ayumu offer his umbrella to a stray cat on a rainy day; moved by this, she gave her own umbrella to him. Taeko maintains close friendships with Kanami Mihara, Yuki Yoshida, Tulio Orito, and Shimomura. Alongside Kanami, she offers romantic advice to Yuki, though her suggestions often miss the mark. She enjoys reading and possesses a strong aversion to horror films, especially anything involving zombies. Unaware that Ayumu is a zombie, this fear presents a persistent irony. Across official media, she consistently appears as a supporting figure within Ayumu's school life.