In a high school located in a Japanese town, Okazaki Tomoya, a third-year student, does not take his studies seriously. Always late for class, he is seen as a delinquent by the rest of his classmates who are busy preparing for their entrance examinations. Needless to say, he does not have too many close friends.

Tomoya does not seem to mind though — until one day he meets Furukawa Nagisa, who is left alone without friends on this school, because everybody she knew already graduated. What a clumsy girl, he thinks at first. But he keeps running into her and so, while helping her, starts to cherish her positive and life-embracing character.