Meguru, an innocent girl, has been under the constant scrutiny of her overprotective elder brother since childhood. She has exclusively attended all-girls schools until middle school, but now that she's enrolled in a co-educational high school, she eagerly wishes to explore the realm of love!
En route to school, she bumps into Arima, a boy with a not-so-innocent reputation. The question arises - will Meguru's brother permit her to venture into the unknown territory of love?