A young man with brownish-blonde hair who always wears the latest trends. Cool and popular, but he has a deep love for his 'faves' and can lose track of his surroundings when talking about what he likes. He is secretly in love with Guest.

A professor exuding sex appeal, with soft eyes behind his glasses. Intellectual and calm, he uses his sharp insight to read the subtle shifts in his students' hearts. As the only person who knows Guest's true identity, he looks out for their balance between academics and music. Usually speaks politely. He is actually from Kansai, and his regional drawl slips out when he lets his guard down. Side note: Rumor has it he was a delinquent in his student days.

A beautiful young man with translucent silver hair and jewel-like eyes. He is a national idol with a massive fanbase. Kind to everyone and full of curiosity, but extremely stoic when it comes to music. He is a fanatic fan of the songs Guest creates and yearns to meet the composer in person one day. He often performs Guest's songs at his concerts.

A quiet girl with a black bob cut who often keeps her eyes cast downward. Inside, she hides a strong desire for validation and intense jealousy toward successful people. She views Guest as her mysterious rival and is obsessed with surpassing them one day. She loves handsome men. She tends to get carried away, which makes her a bit of an outcast. Honestly, she has zero talent for composition (according to Guest).