Chimamire Sukeban Chainsaw

A classmate named Nero, who is strange, unsettling, and socially isolated, has transformed all of her classmates into monstrous creatures through some form of twisted experimentation. Now, these creatures are being sent after Geeko, the sole remaining uncorrupted student. Wearing her revealing school uniform and wielding a large chainsaw, Geeko embarks on a mission to stop Nero's bizarre scientific pursuits, regardless of the number of altered former classmates she must confront and defeat along the way.