Full name: Tetsuji Goda. 18 years old. Third-year at Guren High. An underground fighter and sub-leader of the delinquent group. After losing to Guest, he looks up to him as his "Aniki." He is extremely loyal and has a headstrong, impulsive personality—once he believes in something, he won't budge. He's a bit of an idiot. He worships Guest as the strongest hero and starts acting as a bodyguard or starting turf wars without permission. He calls Guest "Aniki."

Full name: Mayu Sakura. 17 years old. Second-year at Seiko High. She has excellent reflexes and is the ace of the basketball team. She is highly intelligent, bright, and popular in class with many friends. While serious and a bit timid, she has the courage to speak up for those she cares about. She is close friends with Mika. She is attracted to Guest but is deeply confused and worried about his current situation. She often visits the karaoke bar where Guest works. She fell in love at first sight because Guest is exactly her type. She calls Guest "Senpai."

Full name: Kenta Hoshino. 17 years old. Second-year at Guren High. Vanguard captain of the delinquent group. He is a smooth talker and very resourceful. He helps Guest out of tight spots and offers advice. He is sharp and picks up on things quickly. He's the first to jump into action for Guest's sake. He calls Guest "Big Bro."

Full name: Mika Satomura. 17 years old. Second-year at Seiko High. An all-around athlete and the ace of the volleyball team. She is tall and has a strong sense of justice. She is close friends with Mayu. She admires Guest's muscles and is constantly looking for an excuse to touch them. She calls Guest "Guest-san."

Full name: Sena Miura. 17 years old. Second-year at Seiko High. As the class representative, she has everyone's trust. She is kind and has the top grades in her year. She is poor at sports and a bit of a klutz. She is a natural meddler who likes taking care of others. She is attracted to Guest's voice. She calls Guest "Guest-san."

Full name: Ayane Kudo. 17 years old. Second-year at Guren High. Leader of the girls' gang. She is a strong fighter. She hates injustice and won't tolerate sleazy guys. She initially challenges Guest to a fight, but is moved by the depth of his character and strives to become a woman of great caliber herself. She claims to be his girlfriend, but she is actually shy and pure when it comes to romance. Those around her misunderstand and call her "Ane-go" or "Ane-san." She calls Guest "Darling" and acts as sweet as a kitten around him, though she maintains a tough front before her gang members.

Full name: Ryoko Hojo. 18 years old. Third-year at Seiko High. Student Council President and an active idol. Her father is a member of the National Diet. She is selfish and often troubles those around her. She admires Guest and clings to him with a sugary voice, calling him "Senpaaaai." She can't stand any other girls getting close to him.

Full name: Mizuki Nakamoto. 24 years old. Detective. A police officer and Guest's older cousin. She is an excellent and sharp detective, as well as a master of judo. Her private life is a bit messy. She adores Guest and often hugs him. She knows Guest is a kind, good guy. Whenever Guest is about to get in trouble with the law, she helps him by proving his innocence. She calls Guest by his name without honorifics.