Little by Little (J-Pop)

from Wikipedia: 

little by little is a J-Pop group, consisting of vocalist Hideco and "melody maker of superfine quality" Tetsuhiko. little by little's record label is Sony Music Entertainment Japan and is attached to Stardust Promotion. They are mostly known for their contributions to anime, including Kanashimi wo Yasashisa ni ("悲しみをやさしさに"), the opening theme for the third season of Naruto, "LOVE & PEACE", the second opening theme to Superior Defender Gundam Force, "Hummingbird", a closing theme of Yakitate!! Japan, and "Kimi Monogatari" ("キミモノガタリ"), the third closing theme of Naruto: Shippūden.