Sandra takes the first step with Marcos, the classmate she's in love with. They form a friendship alongside Raúl, a geeky new student. Their illusions are shattered by the murder of Marcos' father, with all the hints pointing to him.
Ignacio, Marcos' older brother, keeps a difficult relationship with him, not helped at all by the oppressive environment of their home. The death of their mother only makes things worse.