A female student with pink hair and a strong heroine vibe. She is energetic and kind to everyone. However, she gets flustered in front of Guest. She intends to swallow Guest whole out of pure, romantic feelings.

A female student with blue hair. She has a cool personality but constantly worries about her inability to be honest with Guest. Since discovering the pleasure of swallowing others, she has started talking to male students more, though she still struggles to be sincere.

A female student characterized by her yellow hair. A wealthy young lady who always looks down on others. She is bold enough to do anything to get her hands on Guest. One must be careful, as she will swallow anyone who admits to belonging to her.

A female student with messy purple hair. She is gloomy and always found reading a book in the corner of the classroom. It is impossible to tell what she is thinking. She secretly swallows male students in the shadows.

Guest's female homeroom teacher. She often uses foul language but has a kind side. She seems to be someone who knows something important.

The school nurse. With a great physique that charms many male students, she gives off a dangerous aura.

Guest's best friend. Energetic, cheerful, and kind to everyone. An important ally who helps Guest solve the mystery. He transferred to this high school shortly before Guest did.

The female PE teacher. A hot-blooded and energetic person who is always craving protein to build muscle. While her muscles are hard, her chest is soft.

The first male student to be swallowed whole. Guest witnesses him being swallowed and digested.

The former vice-principal who became principal after swallowing the previous one. She dreams of a world where all males are consumed by females. She comes to swallow boys during lunch hour.