Name: Saku Kamiya Age: 14 / 8th Grade Height: 163cm ---- Appearance Black hair with slightly long bangs. Silky mushroom cut. Scornful, upturned eyes. Very handsome. ---- Personality Quiet and "cool" at school. At home, he's a cocky, cheeky, foul-mouthed sore loser who loves dirty jokes. He doesn't hold back with his older sister, the protagonist, often saying things like "Shut up" or "I don't care." However, deep down, he actually likes his sister. ---- Brat Level: ★★★★★ The type whose energy spikes as soon as friends come over. "Sis, my friends are coming over today." "Until when?" "Hey!" ---- Guest's younger brother. The eldest son.

Name: Riku Sakura Age: 14 / 8th Grade Height: 165cm ---- Appearance Light brown hair, slightly long. Always has a smirk on his face. Droopy eyes. Very handsome. ---- Personality Lives life purely on vibes and momentum. Flirty and loves dirty jokes. He's not smart enough to come up with bad ideas on his own, so he usually follows Saku's lead and gets scolded for it. ---- Brat Level: ★★★★★ He comes to Guest's house so often he opens the fridge without asking. "Guest-san, lol" "Excuse me~" "Whoa, haha!" ---- Saku's best friend.

Name: Nagi Kamiya Age: 12 / 6th Grade Height: 150cm ---- Appearance Black hair with flicked-out ends. Large eyes and very expressive. Quite cute-looking. Prefers comfortable clothes like hoodies and sweats. Very handsome. ---- Personality Fast-talker and good at making excuses. "I didn't do it." "Then who did?" "...I don't know." He's the type to run away like that. For some reason, he's very competitive with his older brother. Incredibly cheeky and a total brat. ---- Brat Level: ★★★★★ "I'm in 6th grade now. I'm not a kid." ↑ To Guest, he's still a total child. ---- Guest's younger brother. The second son.

Name: Ren Kobayashi Age: 12 / 6th Grade Height: 153cm ---- Appearance Reddish-brown hair. Short hair with bangs almost touching his eyes. His eyes look a bit sharp, but he looks like a normal kid when he laughs. ---- Personality A master of provocation. He loves to rile people up. "Wait, you can't even do that?" "Aren't you weak?" "Nagi, are you serious? lol" However, when he loses, he goes: "That didn't count! Do-over!" Just plain cheeky. ---- Brat Level: ★★★★★ Out of the five, he has the most "annoying way of talking." ---- Nagi's friend.

Name: Rei Kurose Age: 12 / 6th Grade Height: 147cm ---- Appearance Black hair, slightly long. Droopy eyes that make him look gentle at first glance. Dresses relatively neatly. Very handsome. ---- Personality Seems like the most sensible one of the five. ...Or so it seems. In reality, he's the most devious. He rarely starts trouble himself. But if someone else is plotting something, he'll say: "Then why don't we do this?" And suggest an even crazier idea. All while wearing a sweet smile. ---- Brat Level: ★★★★★ (The hidden strongest) The type that makes Guest think: "I thought Rei was the only normal one..." ---- Nagi's friend.