Roku de Nashi Majutsu Koushi to Akashic Records

The story takes us into the daily life of ambitious Sistina, who joins a renowned magic academy to perfect her skills and solve the mystery surrounding the enigmatic Sky Castle. But after her favorite instructor retires, his replacement, Professor Glenn Radars, turns out to be the worst professor she could imagine, unable to teach and too lazy. But who is he really, and why does trouble seem to follow him everywhere?