Kirisaki Fumio's just an ordinary highschool girl in love...

...but then she finds out that the guy she's fallen for happens to like someone else.

And then she gets into a fight with a friend... that and various other things are getting her really down...

...so she decides to go out and get a chainsaw.

And take it to school.

And kill the boy she likes, and herself afterwards.

Along with anyone who happens to get in the way.

The story revolves around Koyomi Morishita, a clumsy high school freshman girl who is often mistaken for a grade-schooler because of her shortness. Koyomi becomes a disciple of Misa Anehara, a 25-year-old graduate student who happens to be one of the most powerful modern-day magicians.