Amakawa Noble School gathers the country's most gifted young people to prepare them for the crises of the 21st century. Its five most exceptional students are known as crowns. When crown leader Saku survives a terrorist attack thanks to the intervention of a new transfer student named Shinri — invited to become the sixth crown — the dynamic shifts immediately. Shinri wants nothing to do with the school's hierarchy and intends to change things on his own terms. Saku decides she cannot afford to look away from someone that unpredictable.