Question: Which writer illustrated a Japanese Manga Series which spent 18 weeks at the top of the New York Times Manga Best Sellers list of 2009?
Sentence (from "The New York Times Manga Best Sellers of 2009"): Of these, eight titles reached the top of the weekly list (in order of number of weeks at the top of the list, from highest to lowest): "Naruto", 18 weeks; "Bleach", 9 weeks; "Vampire Knight", 7 weeks; "Fruits Basket", 4 weeks; "Negima!
Relevant evidence: Yes