A Week

Sai has been addicted to heroine for more than a year now. She didn't have a lot of time left if she continued living in the same fashion.

Zack was her best friend. Well, used to be. They haven't been talking a lot lately, also thanks to the drugs.

Now Zack takes her in, and he has a week to take her off of drugs.
This could've been a lot easier had she not been so unwilling.

Is there any chance for them to succeed?