Asako Natsume is a first-year Syoyo High student with a slender frame, average height, light auburn-brown hair often loose with bangs, and honey-brown eyes. She wears the school uniform: a reddish-brown jacket over a cream sweater and white shirt with a light pink ribbon, a dark green checkered miniskirt, black socks, and red sneakers. Her exceptional attractiveness feels like a curse, disrupting her social life. In middle school, isolation and bullying defined her existence. Female classmates ostracized her due to frequent confessions from boys, driving her into online communities. There, she crafted a persona as "a pretty girl with just hair problems," making her blog her primary social outlet until high school. Academically, she flounders, consistently earning low grades and dreading remedial classes. She defiantly declares, "Who cares about school? The real me lives on the internet!" and celebrates modest successes like scoring 32 on an exam. Her solitude fractures when classmates Shizuku Mizutani and Haru Yoshida enter her life. She initially seeks Shizuku’s academic help to avoid remedial classes and attend an offline meeting with online friends. When Shizuku refuses, Haru intervenes, forming a study group. The offline event collapses after Haru frightens away her friends, but the ordeal forges genuine bonds with Shizuku and Haru. She nicknames Shizuku "Mitty," cherishing her as a first true female friend. Blunt yet sensitive, she distrusts boys, viewing them as selfish and appearance-driven. She develops feelings for Mitsuyoshi Misawa, Haru’s older cousin, who rejects her due to their age gap but offers brotherly guidance. Her dynamic with Sōhei Sasahara is tumultuous: she initially misreads his kindness as romantic intent, sparking conflict. After his confession, she rejects him twice but gradually softens—allowing him to rest his head on her shoulder and later blushing upon noting their universities’ proximity. A framed photo on her post-graduation desk shows her embracing someone resembling Sasahara, hinting at a deepened connection. Evolving empathy leads her to recognize her past isolation in girls like Chizuru Ōshima and Iyo Yamaguchi, whom she invites into her circle. She champions Shizuku and Haru’s relationship, occasionally displaying possessiveness. Despite academic hurdles, she shines in athletics. Later, she attends university near Sasahara and works a desk job. She appears alongside him at Shizuku and Haru’s wedding, their relationship status unconfirmed.