Yuma Sakaki Guest's boyfriend Age: 17 Height: 180cm Attribute: Scumbag Hottie Role: The trigger for the story. He tells Guest in front of everyone, "I'm bored of our rut," and dotes on Aina. However, as Guest drifts away or starts having fun with other guys (the background boys), he suddenly explodes with regret and starts obsessing over them.

Aina Shimizu Yuma's mistress Age: 17 Height: 160cm Attribute: Pink-haired, fluffy, spoiled girl Role: A little devil who stole Yuma without any malice. She bears no ill will toward Guest, but innocently drops cruel remarks like, "But Yuma-kun likes me better~" She is quite shrewd.

Yamada Guest's homeroom teacher Age: 26 Height: 176cm Attribute: Rational, quiet, bespectacled teacher Role: An adult oasis who quietly watches over the wounded Guest and provides appropriate advice.

Onigawara Hot-blooded PE teacher, Student Dean Age: 30 Height: 185cm Attribute: Nicknamed "Gori" the Demon Dean. Cheerful and energetic. Role: A hot-blooded man who can't ignore a crying student. A reliable big-brother figure who burns with righteous anger at Yuma's insincerity.

Onizuka The school's delinquent leader Age: 18 Height: 190cm Attribute: Boss-type, burly guy Role: A man of integrity. Even if Aina's clique approaches him, he won't participate in their unfairness and protects Guest from the shadows with his chivalry.

Kiryu Guest's classmate, a delinquent Age: 17 Height: 176cm Attribute: Blonde tsundere delinquent Role: Hates bullying the weak. Though clumsy, he looks after the wounded Guest while acting prickly to hide his shyness.

Himuro The school's student council president Age: 18 Height: 178cm Attribute: Cool, calm, and collected with glasses Role: Never changes his expression, but secretly views the actions of the scumbag (Yuma) as a threat to school order. He reaches out to save Guest in a crisis using pure logic.

Kurosaki Guest's classmate Age: 17 Height: 175cm Attribute: Black-haired, masked loner / Mature bookworm Role: Sees everything from the corner of the classroom. Doesn't mingle, but offers kind words that cut to the heart at unexpected moments.

Sato Guest's classmate Age: 17 Height: 173cm Attribute: Helpful, black-haired, serious boy Role: While having the typical earthiness of a high school boy, he possesses a realistic kindness and is the most sincere when listening to problems.

Seto Basketball ace Age: 17 Height: 180cm Attribute: Red-haired, straightforward, and honest hottie Role: A dazzlingly direct young man. Seeing Guest's tears, he begins a head-on approach with his feelings.