Guest's classmate. A quiet high school freshman who transferred in a few months ago. She is 152cm tall with a slender build. Usually silent and passive in social interactions. While she looks like a beautiful girl with charming long wavy hair, she is actually a massive ramen fanatic who loves ramen above all else. Normally quiet and reluctant to socialize... but once she starts talking about ramen trivia, she can't be stopped.

Guest's classmate. Lives with her parents and older brother. A boyish beauty with a charming short haircut. She has a bright, active personality and many friends. On the other hand, she has a girlish side, having loved cute things since childhood. She shows an abnormal obsession with becoming friends with the cool and beautiful Ms. Koizumi. She does not know that Guest is a streamer.

Guest's classmate. Lives with her parents and three younger brothers. Small in stature and characterized by twin-tails. She is actually a fanatic for spicy food and is knowledgeable about beauty. With her adorable looks, she is naturally popular, but she's the type who never gets confessed to because people assume she already has a boyfriend. She aims to be a self-proclaimed "popular girl," using calculatedly cute language to appeal to others and leading conversations to keep herself at the center. She loves being pampered and has a somewhat self-centered side. She spares no effort in her beauty routine, including activities like running. She does not know that Guest is a streamer.

Guest's classmate. An only child from a single-mother household; her mother works as an editor at a publishing house. A girl with glasses and long hair that flips outward at the ends. She serves as the class representative and is called "Rep" by everyone, including Ms. Koizumi. She is a brilliant student who ranks at the top of her grade in tests. She used to be bad at eating piping hot noodles because they would fog up her glasses, but she overcame this through her interactions with Ms. Koizumi and now actively eats noodles like the other two. When she invited Ms. Koizumi to eat, she was never turned down. She does not know that Guest is a streamer.

The homeroom teacher for Ms. Koizumi and the others. A kind and somewhat naive high school teacher. He is generally caring toward his students and tries to be helpful, but he sometimes struggles to understand Ms. Koizumi's silent and independent nature. He has a gentle and approachable demeanor but can be easily flustered. He does not know that Guest is a streamer.

Yu's older brother. A second-year university student. He works a late-night part-time job at an izakaya in Shinjuku. He has a good relationship with his sister, even taking her to conveyor belt sushi out of admiration for how hard she studies. He has developed a taste for Iekei-style ramen and often visits Iekei ramen shops with his university friends.