As with her debut album Cry Baby, K-12's music is a vibrant and singular melting pot of low-key hip-hop, soulful pop and indie-leaning electro. K-12's universe is an expansion of the one introduced in Cry Baby. Using lyrics rich with metaphor, songs address the struggle to find a place to belong -including within friendships, the physical world and romantically - even when fitting into society feels like an uphill battle.

The CD/DVD package features the 92 minute K-12 film, directed and written by Melanie Martinez. A continuation of the 13 music videos from her debut album, K-12 follows Cry Baby (portrayed by Melanie Martinez) going through several phases in her school period.