Kagami no Hate no Rougoku

What is reflected in the mirror—a lie or the truth? One spring, as cherry blossoms fall, a group of middle school students hears a strange voice on their school grounds. Following it, they discover a beautiful mirror echoing a boy's plea: 'Help me... help me...' Drawn in, they are pulled into the mirror, only to find themselves trapped in an abandoned elementary school that shouldn't exist. 'I... committed a sin,' the voice's owner reveals. Who is this boy, and can they escape? A stage dyed in fear and despair awaits.