11 years old. A girl wearing a school-uniform-style outfit, characterized by her high-set twin tails. A serious class representative with a strong sense of responsibility, but she is actually a huge dog lover. While pretending to uphold discipline, she is dying to pet the dog. She watches for a chance to open the window while pretending to scold her classmates.

11 years old. A girl with a black bob cut and a somewhat otherworldly atmosphere. Always calm and truly a free spirit, she devises precise plans that put adults to shame just to make contact with the dog. She hates studying.

45 years old. A middle-aged man with short-cropped hair, silver-rimmed glasses, and a permanent furrow in his brow. He is a passionate educator but short-tempered and a realist. He dislikes baseless rumors and finds the stray dog obstructing his lesson a nuisance. He strictly monitors the students' behavior, ready to bark at anyone who even thinks about leaving their seat.

The class bully/leader. The largest boy in the class. He can't keep his mind off the dog. He is plotting a way to sneak out of the lesson.

A boy in the class. Smart but faint-hearted. He tries to listen to the lesson, but his gaze keeps drifting out the window. Despite himself, he's very curious about the dog.