TV-Series
Description
Kasumi Nakasu, a first-year Nijigasaki High School student born January 23 (Aquarius), stands at 155 cm with blood type B. Her image color is pastel yellow (#e7d600), and she consistently refers to herself as "Kasumin." Passionately devoted to becoming Japan's top idol, she dedicates significant effort to singing and dance lessons. Kasumi was the sole remaining member of Nijigasaki’s disbanded School Idol Club, leading her to declare herself president. She revived the club by recruiting Ayumu Uehara and Yu Takasaki, maintaining her leadership as new members joined.

Her personality blends intense competitiveness with a lively, mischievous streak. She despises losing and frequently schemes for victory, attempting to sabotage rivals or send blackmail—though these plans often fail or backfire. Kasumi exhibits sore loser tendencies when not finishing first. Despite this self-centered behavior, she shows genuine kindness, rallying the group to support Ayumu’s nerves or exchanging heartfelt gifts. She harbors a strong dislike for the nickname "Kasukasu" (meaning "just barely" or "dried out"), stemming from past bullying, and reacts negatively when addressed this way.

Her daily rituals include baking bread for 2–3 hours and watching idol videos for 3–4 hours. She allocates one hour to jogging and reserves a secret nightly activity after 9 PM. Academically, she favors science and home economics for hands-on activities like mixing experiments but dislikes classical literature and history, citing a forward-looking mindset. She performs in the subunit QU4RTZ and collaborates with Dengeki Online alongside Karin Asaka and Setsuna Yuki.

Physically, she possesses short grey-brown hair, light magenta eyes, and a slim build. A yellow star-and-crescent-moon hairpin on her left side is her signature accessory. Her measurements are bust 76 cm, waist 55 cm, and hips 79 cm.

Her journey across media highlights her evolution from a solitary club survivor to a determined leader. In the anime, she rebuilds the club by recruiting members and sustaining activities despite setbacks. Game storylines (e.g., *All Stars*) reveal deeper layers: her vulnerability regarding "Kasukasu" and her complex relationship with a cherished senpai she hopes to perform alongside. Mischievous antics like the failed "Snack Seduction" plan to eliminate rivals underscore her flawed yet earnest pursuit of idol excellence.