There are two things you should know about the upcoming film To Write Love On Her Arms. First, the obvious stuff: It stars Kat Dennings as a Florida teenager named Renee. Renee has bipolar disorder; she falls into a downward spiral of addiction and abuse, only to be pulled out of it by friends including Chad Michael Murray and Rupert Friend.

The second thing you should know: As the trailer says, the film’s story inspired a movement.

To Write Love On Her Arms “is a non-profit movement dedicated to presenting hope and finding help for people struggling with depression, addiction, self-injury, and suicide. TWLOHA exists to encourage, inform, inspire, and invest directly into treatment and recovery,” as it says on the organization’s website. The film is named after the nonprofit, which in turn was named after a blog post written by founder Jamie Tworkowski about a real-life Renee who was struggling with addiction and abuse.

In this sense, To Write Love On Her Arms is also a promotional film—the synopsis on its IMDB page mentions that the film ultimately leads to the founding of the titular charity group.

To Write Love On Her Arms will be released in March of 2015.