The story takes place in an age where "Ajin" (demi-human),more casually known as "Demi," have slowly started to become accepted into human society. Tetsuo Takahashi is a biology teacher who ends up teaching three such Demi, hoping to understand more about them while also managing to catch their attention.

• Minami Shinoda
• Kaede Hondo
• Yoko Hikasa
• Junichi Suwabe
• Shiina Natsukawa
• Lynn