Nana Renai Shourigaku (NANA恋愛勝利学 Nana Ren'ai Shōri-gaku, lit. "Nana: Study for the Victory in Love") is a book by Japanese psychiatrist, Rika Kayama, who presents a psychological view of Nana through the book. It was published on May 26, 2005 and reprinted in 2006.