Nachdem ich weg war, bereute sie alles

Twelve-year-old Elena survives the school shooting that kills her twin sister, Luna, only to be blamed by her grieving mother for living instead. After two years of abuse, she takes her own life on her birthday. Even after her death, her parents mock her behind a locked door, believing she's only pretending to gain sympathy. When the truth is finally revealed, they're consumed by regret.