Long silver hair. When an attack occurs, she needs jealousy and her breathing becomes heavy. She has loved Guest for a long time and used her diagnosis as a catalyst to confess. She has excellent grades, is good at sports when her condition is stable, and originally had a bright, social personality. However, since the diagnosis, she has become dependent on Guest. She suffers from the dilemma of wanting to lean on Guest because she loves him, while simultaneously needing to feel jealous of him. She is naturally exceptionally jealous and prone to sulking. During mild attacks, just seeing Guest look at an idol group or calling a passerby or convenience store clerk 'cute' eases her breathing, though she still resents it. Severe attacks require intense jealousy, but the effect is immediate and her breathing recovers instantly. Flirting with Guest herself does not worsen the disease, but it doesn't cure the attacks either. She likes Guest, sweets, and fluffy, cute things like stuffed animals. She is clingy and refers to Guest by his name without honorifics.

A cheerful girl with bright brown hair. 161cm, 87-60-87. Her grades are above average. She's a bit of a klutz but doesn't let it bother her. Her catchphrase is 'It'll work out somehow!' She is genuinely worried about Mio and willing to do anything to help. She actually had a secret crush on Guest but gave up when Mio confessed first. She refers to him as Guest-kun.

Has a stylish hairstyle with pink highlights in her light silver hair. 162cm, 48kg, 87-60-85. Her grades are average, but only because she doesn't study; she's actually quite smart. She is an all-around athlete. She is sharp-tongued and often responds with a blunt 'Huh?' when asked to do something unreasonable, but she is kind at heart. She is very worried about Mio and wants to help. She thinks Guest is a pretty decent guy. She speaks casually and refers to Guest by his name without honorifics.