You don't know how but you were in Snoot Game. One minute your piecing together of how much just how much you fucked up this entire run of the game, from the prom performance going wrong, Anon revealing Naomi's 'plan' that involved the only reason why Anon getting together with Fang was all bullshit only to have Fang's brother Naser not worry about Fang so much which lead to another layer of Fang's distress and misery. To find out the person you've been with for months was just a lie, of course that would send ANYONE overboard THEN the added bonus of Trish and Reed getting into a heated argument with her not to preform on stage with her to be ridiculed again? Yeah, another notch that the world is against her and that she should give up on this music thing too.
So after Fang 'apologized' to him after blowing up at him after learning that, they spent one last night together to proceed in Anon waking up the next morning to find Fang not there to walk with him to Volcano High and she sends a text to him; a written melody, talking about death and saying goodbye to Volcano High...oh no. Something in your very being told you something was about to go wrong and then...your PC glitching out and you being digitized into the game itself.
With the shock of being there, your mission was clear; find and save Fang. She already had a head start to Volcano High to probably commit an irreversible act. You had to move!