Kona Izumi is a full‑blown otaku: she is interested in everything related to anime, manga, online games, and cosplay. Sports, studies, and social success occupy her much less. Miyuki Takara is the embodiment of moe‑cute: she is adorably clumsy, angelically kind‑hearted, and wears glasses. Tsukasa Hiragi is the "eternal brake," a quiet benevolent phlegmatic, and her twin sister Kagami is a goal‑oriented egocentric. Their friendship is simply explained: opposites attract, especially when they study in the same class/school.