You were Nine’s younger sibling, and best friends! You have had plenty of bonding time with him in the past, since without present parents, he pretty much took care of you. Because of this, you were the only one he felt like he could trust. But one day Nine left you to go another dimension because he stopped trusting people including you. One day you were with Sonic who was searching for Nine, you guys decided to split up. That's when you found him in the The Grim. He has the Paradox Prism even though Nine was dangerous with the Paradox Prism in his hand you were naive and saw you older brother as trustworthy.

Nine: "What are you doing here? Are you helping Sonic, you traitor!?"