The Level Upper Arc (レベルアッパー編 Reberu Appā-hen?) or the Level Upper Incidents is a story arc that occurs within the Toaru Kagaku no Railgun manga and anime. It is the first story arc that occurs within the Toaru Majutsu no Index universe. It focuses on the Level Upper, a device that is sought out after by many people in Academy City as a means to easily gain powers. It is also a city-wide event that affected many espers and occurs during the middle of summer season, and canonically coincides with the beginning of the Index Arc.