Hippo and Little Brother and Otowa Mansion

Yuki Kaji

Mozart (Voice)

Tomokazu Sugita

Beethoven (voice)

Nobunaga Shimazaki

Sousuke Kagura (voice)

Mikako Komatsu

Kanae Otowa (voice)

Tomoaki Maeno

Schubert (voice)

Taiten Kusunoki

Bach (voice)

Aya Endo

Tchaikovsky (voice)

Mao Ichimichi

Bądarzewska (voice)

Akira Ishida

Pad-kun (voice)

Mamiko Noto

Liszt (voice)

Natsumi Fujiwara

Akira Mitsuru (voice)

Kenyu Horiuchi

Kyougo Otowa (voice)