Tomoko Kaneda
Maskuma (voice) (16 eps)
Daisuke Ono
Head of the Research Institute (voice) (12 eps)
Yoji Ueda
Brian-sensei (voice) (12 eps)
Hochu Otsuka
Narration (voice) (12 eps)
Chiemi Tanaka
Rikka (voice) (11 eps)
Natsumi Murakami
Chiyo (voice) (11 eps)
Ayane Sakura
Sekine (voice) (11 eps)
Megumi Han
Tsubasa (Tsuyoshi) (voice) (11 eps)
Yu Serizawa
Tsubasa (Older Sister) (voice) (11 eps)
Yuya Hirose
Hanzо̄ (voice) (11 eps)
Yuri Ise
Inoue (voice) (2 eps)
Rie Hikisaka
Teacher (voice) (2 eps)
Kosuke Echigoya
Space Monster Mentaiko (voice) (2 eps)
Yukana
Soothsayer (voice) (1 eps)
Rena Otsuki
Upskirt Girl (voice) (1 eps)
Min Konno
Sexy Lady (voice) (1 eps)
Shoya Ishige
Male Student 1 (voice) (1 eps)
Anan Furuya
Male Student 2 (voice) (1 eps)
Hayato Dojima
Male Student 3 (voice) (1 eps)
Kozue Saito
Cosmic Pig Host (voice) (1 eps)
Hisako Kanemoto
Woman with Swimsuit (voice) (1 eps)
Takehiro Urao
Pickup Man 1 (voice) (1 eps)
Akira Sekine
Caster (voice) (1 eps)
Hironori Kondo
Man in Marriage Agency (voice) (1 eps)
Tomohiro Ono
Male Student 1 (voice) (1 eps)
Masaya Wada
Male Student 2 (voice) (1 eps)
Kikunosuke Toya
Male Student 3 (voice) (1 eps)
Soma Saito
Sekine (Boy) (voice) (1 eps)
Kaito Ishikawa
Chiyomaru (voice) (1 eps)
Jun Fukuyama
Handsome (voice) (1 eps)
Serina Machiyama
Tsubasa's Ideal Woman (voice) (1 eps)
Chiharu Sawashiro
Abominable Man (voice) (1 eps)
Katsumi Fukuhara
Classmate Boy (voice) (1 eps)
Akira Kuwabara
Clerk (voice) (1 eps)
Kohsuke Tanabe
Inoue's Friend (voice) (1 eps)
Honoka Inoue
Woman Enjoying an Amusement Park (voice) (1 eps)
Nao Ojika
Student 1 (voice) (1 eps)
Kotomi Aihara
Student 2 (voice) (1 eps)