Negima!? Magister Negi Magi Episode 17: Natsumi, Family Will Always Be the Home Run King of Bonds. Don`t You Agree? I Don`t Understand What You Mean at All, Chizuru.
Episode 17 of 26 of Negima!? Magister Negi Magi, aired January 24, 2007, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Asuna and Konoka are about to take a bath but before they could, they stumble onto Nekane Springfield, Negi's older sister. Konoka and Setsuna find it to be a bit strange for Nekane to just appear in the World of Illusions and decided to investigate Nekane's sudden appearance.