Le maître magicien Negima ! s01e19
Titre original : Words Fly Away, Those Written Remain (Verba volant, scriptamanent)
Kazumi starts investigating about a classmate named Sayo Aisaka, whom everybody seems to not notice she is present, not even Kazumi herself. It turns out Sayo was a student of Mahora Academy during the 1940s — and is now a ghost.