Certain Death, Uncertain Hour

Synopsis

With the help of Lingshen and Satomi's time machine, Negi transports himself and Chamo to 1993 Germany to know more about Asuna's magic cancelling power and discover ways to bring her back in the present. In the process, Negi unknowingly takes along the rest of Class 2-A with him, who were trying to find him. (Source: Wikipedia)