Destroying The Game

After discovering Sora kissing Stephanie, Shiro runs away and climbs up to the roof of the castle. There she meets Tet who talks to her about something that was kept a secret from her. "My true goal was one thing, to destroy this world. Whose help do I need to achieve this? It's you Shiro. So how about you come with me?" "I'll. . .come with you."