Kelsey is going through puberty, and her body is changing. She not only has to endure her shifting body, but also the vicious school bully. She has a big chest and a period she finds revolting, but is surrounded by girls still in training bras. Her family is of little help, as all her stepmother, Hilda, can say is how Kelsey should be proud of her big cleavage. Her boobs, however, are the target of the violent school bully, Billy. He even broke her nose. One night, on her monthly periods under the full moon, Kelsey gazes into the mirror. Feeling totally fed up, she shuts her eyes tight—and something happens. She transforms, literally. Kelsey is a werewolf. Her human reflection has been perfectly changed into a massive, sleek wolf. Thus begins a series of nightly roaming, and then hunting. Kelsey starts with eating dogs. One day, she suggests to Billy that they meet up in a park at night. Gullible and voracious, he agrees, thinking she'll willingly strip for him in public on a cold night. They are to meet under a full moon. She transforms and stalks him, and just as he is ready to leave, she pounces. All that is left of Billy is a carcass. Kelsey continues these killings, picking certain people. Her town is horrified by the “Full Moon Killer.” She’ll have to expand her terrain, once she is old enough to drive, of course. With Billy gone, the kids at school stop picking on her. She is even invited on a double-date. With the New Years arriving, Kelsey makes two vows: one, to not be self-conscious about her body, and two, to never eat another dog.