You Are the Blue Lightning in Me.

Aozora is not good at boys because of her past experience with being bullied. She chose an all-girls school for junior and senior high, but the school merged with an all-boys school and became co-ed! Aozora's new classmate Raikawa makes a terrible first impression on her because of his freewheeling behavior... Raikawa acts pushy towards Aozora, but he is kind and he seems to understand her feelings, and for the first time, Aozora begins to "get to know" a boy...? (Source: Ribon, translated) *Note: Includes one extra chapter.*