title: Saki Hiwatari
context: Saki Hiwatari(日渡 早紀,Hiwatari Saki, born July 5, 1961) is a Japanese shōjo manga artist. Her first work, Mahōtsukai wa Shitteiru (I Know a Magician) was published in the weekly shōjo anthology Hana to Yume (Flowers and Dreams) in 1982. Her best-known work was Please Save My Earth, a 21-volume series concerning several alien scientists who are reincarnated as high school students in modern Tokyo. The series was adapted into an anime series and published in English.
question: What was Saki Hiwatari's first manga series?
answers: Mahōtsukai wa Shitteiru