Again facing his reflection on the mirror, and again the same idea coming to his mind, putting an end to his life. Inside his clenched fist, mum's sleeping pills, his only hope for escaping the hell esecially designed for him by his schoolmates. His little sister's love being his only reason to endure a life of hardship, Santiago has become, after years suffering the cruellest of bullyings at school, a mere shadow of himself.

Otra vez frente al espejo, y otra vez con la misma idea, quitarse la vida. En el interior de su mano cerrada, las pastillas de dormir de mamá, su única esperanza para escapar del infierno que han fabricado para él sus propios compañeros de colegio. Sin más aliciente para seguir viviendo que el amor por su hermanita Teresa, Santiago se ha convertido, tras años de estar sufriendo acoso en su colegio, en una sombra de sí mismo.

La llegada de Lucía, una niña nueva, extraña y diferente, logrará rescatarlo del universo frío e inhóspito en el que vive, y hará renacer en él la esperanza de volver a sonreír. Pero en el colegio, la persecución continúa y Nacho, su principal acosador, no ceja en su empeño de doblegar su espíritu de un forma u otra. Y Santiago, decidido a no dejarse derrotar, acabará transformándose en aquello que más odia.

The arrival of Lucia, a new classmate, different and awkward, will strike some degree of balance in his life, successfully rescuing him from the cold and barren universe he inhabits and triggering a new desire to smile again. But nothing changes at school: the bullying goes on relentlessly and Nacho, the worst bully, won't give up on his whim to break Santiago's spirit one way or the other. But Santiago, firmly determined not to be defeated, will inevitably turn into the thing he hates the most.