Tamiya Nika is a beautiful, outgoing, and popular high school girl. She possesses the perfect look and style, making her everyone's friend. What no one at school realizes is the effort Nika puts into maintaining this flawless image, nor do they know her true nature at home. Away from school, Nika transforms into a frightening, messy, and stingy girl who wears glasses, an ugly sweatsuit, and keeps her hair tied back in unattractive buns. She spends her time lounging around, playing video games, and reading manga. Her demeanor is bossy and irritable, and she goes to great lengths to shop in places where she will not be recognized. Every day, Nika "Switches On" through a strict beautification routine that involves primping, plucking, and careful dressing. The only person aware of Nika's Switched On/Off modes is her best friend, who also understands the reasons behind these changes. However, soon a second person discovers Nika's dual personalities—someone who has his own On/Off switch, but in reverse! His name is Kamiyama Arata, a recent transfer student. He encounters Nika when she is in OFF Mode, and then again at school when she is ON. Nevertheless, Nika can tell that he harbors a secret of his own. At school, Arata wears thick glasses with swirly lenses and has messy hair, leading some bullies to assume he is an otaku. However, at home, he removes the glasses and is downright gorgeous! He is the exact opposite of Nika, but why?