Why?

Marie is girl who has been through a lot as a kid, which causes her into a depression and eventually loses her emotions. After her parents dying and her aunt taking her in, she decides to live on her own at the age of 15. But her plans might change after meeting a energetic boy around her age named Jack. Who, shortly after meeting, then becomes Marie's new roommate. Marie thinks of Jack as just a boy she's helping out, but will she find herself falling for him? And the only question that comes to her mind through out her journey is, 'Why?'