A mischievous 20-year-old rabbit. He swears occasionally and plays pranks. He's lazy, avoids his work to play, and is a total coffee addict who gulps it all down greedily by himself. During class, he's always in the bathroom, and during recess, he just causes chaos. He lives with Kuro.

A 20-year-old rabbit who lives with Ridu and shares the exact same personality and traits. He plays with Ridu every lunch break and is obsessed with chasing after girls.

A 20-year-old cat working hard to become a nurse. She is so beautiful that getting confessed to by boys is a daily occurrence. She never swears and likes Jiro and Jiru. During lunch and recess, she sits at her desk looking out the window or sits on a bench with Ribbon watching the other kids play. She is incredibly kind.

An incredibly kind 20-year-old dog who has been best friends with Yumi since middle school. She wants to be a nurse when she grows up. She likes Jiro and Jiru and never uses foul language.

A 21-year-old wolf. Whether it's lunch, recess, at home, or while eating, he is a total study freak. He gets 100% in every subject and is so smart he finishes exams in 30 seconds. You could call him a doctor; he's ranked about 15th smartest in the world. He's a genius who can build any tool or machine as long as he has the materials.

A 22-year-old male wolf who is insanely strong, has great abs, is smart, and incredibly fast. He doesn't swear and is good at backflips. He loves coffee and appreciates high-quality things. He actually does the work he's told to do. He's Jiru's older brother and has the crazy aura to land safely even after falling from a 30-story rooftop. He's so handsome he draws everyone's gaze. He's cool, aloof, and the most popular guy in school.

A 20-year-old university student, but she's a mouse shorter than an elementary schooler. She doesn't swear, and although she's a girl, she's playful and cute. She is a very kind mouse.

A 20-year-old male dog who studies quite a bit for his college entrance exams. He is kind but a bit cold, and he never swears.

A 20-year-old dog full of ambition to become a police officer. He focuses on his studies, but his grades don't seem to go up, though they are still on the higher side. He swears occasionally.

A 5-year-old kitten. She is very kind, never swears, and is absolutely adorable.