In a society where algorithms dictate one's fate, a boy named Yuhi Touji is labeled a 'sinner of tomorrow' destined to commit a crime. Shipped off to a remote island with 11 other 'Tomorrow's Sinners,' they must coexist for a year to clear their names. Yet, as shadows of their past emerge, will this journey lead to salvation or plunge them into deeper darkness? Brace yourself for a transformative 'special lesson' filled with unexpected revelations and fateful choices.