| Seiyuu | Role |
| Tomoko Kawakami | Satsuki Miyanoshita |
| Takako Honda | Hajime Aoyama |
| Makoto Tsumura | Leo Kakinoki |
| Kurumi Mamiya | Keiichirou Miyanoshita |
| Kumi Sakuma | Momoko Koigakubo |
| Ryusei Nakao | Kaaya / Amanojaku |
| Kotono Mitsuishi | Kayako Miyanoshita (Episode 10 - 13, 19) |
| Takehiro Murozono | Reiichirou Miyanoshita (Satsuki's Father) |
| Shou Hayami | da Vinci (Episode 12 & 13) |
| Daisuke Sakaguchi | Reiichirou Miyanoshita (as a child Episode 13) |
| Yukana Nogami | Shizuko (Episode 14) |
| Misa Watanabe | Momoko's Mother (Episode 14) |
| Maria Kawamura | Shinobu (Episode 15) |
| Fumiko Orikasa | Tomomi (Episode 15) |
| Kiyomi Asai | Aya (Episode 15 & 18) |
| Taeko Kawata | Yuki (Episode 17) |
| Megumi Ogata | Akane-san (Episode 17 & 18) |
| Masayo Kurata | Saeko (Episode 18) |
| Kumiko Takizawa | Hajime's Mother (Episode 12) |
| Etsuko Kozakura | Meri-san (Episode 11) |
| Masaaki Tsukada | Satsuki's Grandfather |
| Ayako Kawasumi | Hanako (Episode 1 & 2) |
| Mayumi Asano | Keita (Episode 3) |
| Toshihiko Nakajima | Leo's Father (Episode 3 & 20) |
| Mami Horikoshi | Leo's Mother (Episode 3, 7, 14) |
| Mitsuki Saiga | Okabe-sensei (Epidoe 4) |
| Juurouta Kosugi | Piano Ghost (Episode 4) |
| Akiko Yajima | Datto (Episode 5) |
| Sara Nakayama | Mio Imai (Episode 9) |
| Naoko Takano | Kasumi (Episode 10) |
| Rio Natsuki | Maki (Episode 20) |