You hide the 'heart' with a 'sword' and read it as ninja. It is a little different than how you write 'serious' and read it as 'for real'.

Rina Sato

Negi Springfield (voice)

Masahito Yabe

Albert Chamomile (voice)

Akemi Kanda

Asuna Kagurazaka (voice)

Ai Nonaka

Konoka Konoe (voice)

Mamiko Noto

Nodoka Miyazaki (voice)

Yuki Matsuoka

Evangeline A.K. McDowell (voice)

Akeno Watanabe

Chachamaru Karakuri (voice)

Misa Kobayashi

Chizuru Naba (voice)

Norihiro Inoue

Takamichi T. Takahata (voice)

Sawa Ishige

Haruna Saotome (voice)

Madoka Kimura

Yuuna Akashi (voice)

Junko Minagawa

Ayaka Yukihiro (voice)