Densetsu no Ken

An as yet unnamed girl is beaten in her school late at night. She's large, and not very popular (which is why she got beaten). She wakes up somewhere else, in an unfamiliar body. This is her story.

Most of the stuff, like the title and the reason why it's in the bl section, will make no sense with what I have written. Suffice to say that it will eventually be explained, I hope.