"Again" (stylized in all lowercase) is Japanese pop rock singer-songwriter Yui's thirteenth single, and her first single after she went on hiatus in November 2008. "Again" was released on June 3, 2009, by her label Studioseven Recordings and was released in two formats: CD and CD+DVD. The single debuted atop the Oricon Weekly Single Chart, becoming her fourth number-one single. The single has the highest opening week sales for a female act in 2009, which was previously held by pop singer Ayumi Hamasaki's "Rule/Sparkle" for selling 95,000 copies in its first week.[1]