Project A-Ko (1986, APPP/Soeishinsha)

16 years ago a meteor had struck Earth but the area has just re-built itself. A-ko and C-ko are the latest transfer students to Graviton High. The loud talkative C-ko immediately catches the attention of class prodigy B-ko. And so B-ko tries to ruin their relation so she can have C-ko to herself, unaware of A-ko's superhuman strength...