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Asuka helped someone who turned out to be a witch and as thanks she offered him one wish. He said he had just been put in a women's dorm even though he's a boy. She misinterprets this, turns his body into a girl, and runs away before he can react. He must now attend school as a girl and look for the witch in his spare time so she can change him back.

Lulu (Lucius Lucent) is a cold blooded female warrior that makes men in battlefields quiver in fear. Along with her magical armor, Gil, she destroys everything in her path with her overwhelming power… A dark fantasy with an epic setting and a speedy storyline! (From: Akibahara Channel) Warning: Contains scenes of violence and gore. Wikipedia