Brain scientist Nobuko Nakano is under pressure to meet her thesis deadline and loses consciousness from overwork. When she wakes up, she finds herself in another world. She is confused by the impossible situation, but then she rescues her daughter from being burned at the stake. After that, she uses her modern scientific knowledge to overcome the troubles that come her way, and before she knows it, she has become a very important person, known as the "Witch" or the "Savior"!