While looking for clues about his missing father Nagi, Negi Springfield becomes the English and homeroom teacher for Mahora Academy Class 2A (later 3A). Negi soon becomes acquainted with most of his new students including his roommates Asuna Kagurazaka and Konoka Konoe. Negi faces his first real challenge in his student Evangeline A.K. McDowell who is an immortal vampiress and one of his father's enemies. To help Negi confront Eva, Asuna agrees to become his temporary partner by performing a "Pactio", a kind of magical contract sealed with a kiss.