After seventeen-year-old Ash's mother dies, Ash is left with her mother's boyfriend and his children. They bully her by posting embarrassing pictures and making her do their homework. Ash's only solace is the app she developed to help people being cyber-bullied.

Calling herself @Cinders, Ash chats online with a girl named @Charming. Discovering @Charming is Char, a singer who goes to Ash's school, Ash comes to admire Char's courage in self-identifying as a lesbian. Char helps Ash help others, instead of being bitter. Ash finally feels like someone sees that she is special and supports her.

A modern Cinderella, Cinders tells the story of overcoming adversity and bullying with kindness and compassion.