From U-TUBE:If I'm Not In Love - Faith HillNANAの挿入歌、伊藤由奈が歌う”Endless Story"の元歌です。From U-TUBE.Country music artist Faith Hill performing "If I'm Not In Love" from her Breathe album CD version in HD (c) 1998.Song: "If I'm Not In Love"Artist: Faith Hill
http://www.nicovideo.jp/watch/sm32142175