Mari Kurihara is a prominent character in the anime series 'Kangoku Gakuen,' also known as 'Prison School.' She is the president of the Underground Student Council at Hachimitsu Academy, an elite all-girls school that has recently started admitting boys. Mari is known for her strict and authoritarian demeanor, often enforcing the rules with an iron fist. Her intelligence and strategic mind make her a formidable figure within the series. Despite her tough exterior, Mari's character develops throughout the series, revealing complex layers and motivations that drive her actions.