Ranma 1/2 "The witchcraft"

Ranma was a manga character that had a course: When cold water touched his body he turned into a woman. He return his original form by pouring hot water on him. In base of this, "Kotaro", manga and anime fan offer his friend Alexandra Thomas this witchcraft. First she refuses the offering but later, when she's cheated by his boyfriend Leandro, she finally accept. Leandro is bewitched and he must find the way of break it.