Negima!? Magister Negi Magi

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 (1x17)

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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.