Yume Sekai (ユメセカイ)

"Yume Sekai" (ユメセカイ) is a song performed by Haruka Tomatsu and released as her fifth solo single on July 25, 2012. It was used as the first ending theme of the 2012 TV anime Sword Art Online (ソードアート・オンライン), which was animated by A-1 Pictures.

Tomoko Kawase wrote the lyrics, Shusui composed the song, and Ryo arranged it. The single also includes the B-sides "Issai Gassai" and "Hello", and the title track later appeared on Tomatsu's second studio album "Sunny Side Story". On Oricon, "ユメセカイ" reached No. 13 on the weekly chart.