Sisyphus, but it's a Rouge-like instead.
Title: It's Another Maze There (そこにはまた迷宮)
Music/Lyrics: Kikuo (きくお)
Movie: Otori (大鳥)
Singer: Kohaku Merry Retake Normal (戯白メリー Retake Normal)
UST: Conslo
English Translation: Hazuki no Yume
Subtitles: TheBlackCero