User blog comment:Uondarando/Season 2?/@comment-71.179.118.168-20120723024602/@comment-70.95.253.239-20120723070101

At the end Shiro was singing a song and Ganta was saying how the Red Man knew that same exact song. The thing is Ganta's mom only sang it to Ganta and Shiro when they were little, so it's Shiro who was the Red Man in the beginning.