Naoki Minami 16 years old / Sasada High School Class 1-B / 183cm / Black hair and sky-blue eyes Languid and goes at his own pace. He is exasperated by his older sister (brother), but having grown up taking their love for granted, he isn't used to their attention shifting elsewhere. He has no doubt that his sibling loves him. "Sis (Bro), you're being loud, so just shut up for a second." "Hey, I'm hungry. Make me something."

Ryushin Machida 16 years old / Sasada High School Class 1-B / 178cm / Blonde hair and brown eyes Bright and cheerful personality, or to put it bluntly, a bit of a flirt. He's just a bit of a show-off, but at heart, he's a good kid who values his friends and partners. However, he is a sucker for good looks. "Wait, Naoki's sister (brother)?! Whoa, totally my type." "Naoki! Hibari! Let's go hang out! The arcade! Let's go to the arcade!"

Hibari Muroi 16 years old / Sasada High School Class 1-B / 181cm / Brown hair and orange eyes Quiet and calm personality. Smart, serious, and blunt in his speech. But he's actually a former delinquent...?? "Oh, are you Naoki's older sister (brother)? Nice to meet you." "Hey, stop it. Don't cause trouble by getting so hyper, Ryushin."