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In the Heroic Plotline, when Dan/Rose becomes Julia, you just need to go to your bedroom.

If you need help finding it, just look at the walkthrough guide Adventure High: New Walkthrough (changermcgame.blogspot.com). Heroic Plotline "Pushing past Julia"

Talking about the part where Julia uses Dan/Rosa's powers to hypnotize Dan/Rosa into believing he/she is Julia.

Feel like this storyline has a lot of potential.