Tamiya Nika is the epitome of a perfect high school girl however, this is only a facade she puts on at school. At home she wears sweats, a messy buns, switches her contacts for glasses, and has a pair of old underwear called her 'safety underwear'; this her 'OFF' mode. One day at school her other personality gets caught by a handsome boy is there which Nika tries to flirt with but is ignored. Later at the market in her 'OFF mode apparel she meets a four-eyed guy who she helps stuff as many cucumbers into one bag as possible. On the way home she acts like her 'OFF' mode personality only to find out that he lives in her building, and is the new transfer student at her school, Kamiyama Arata. Arata realizes who she is, and she finds out he is the handsome guy from the other day, and make a pact to keep each other secrets. Arata ends up helping Nika when a guy ends up taking a picture of her when she is wearing her safety underwear.