Finn Rivera, with severe myopia. His glasses break, turning his world into a 'mosaic.' He stumbles into the Netherworld Vocational Academy. Through his 'severe myopia,' the terrifying 'Rules of Horror' become comical campus life. The bloodthirsty head teacher is a cool female instructor, and a murderous S-class vengeful spirit is mistaken for his 'anemic and malnourished' well-behaved cousin.