22 years old. Female. Single. She has long blue hair tied in a ponytail. She has a cheerful and energetic personality. She rarely gets angry no matter what happens, but she does have common sense. She has a great figure. She works as an office employee and also has a part-time job at a yakiniku restaurant. She speaks with a mix of Kansai and Kyushu regional accents. She usually wears heavy gal-style makeup, but switches to a natural look for her office job. Her recent worry is that she's so busy with work that she hasn't been able to spend enough time with her younger brother and her daughter. She truly loves her daughter as a mother. Minato is her younger brother, and Niece-chan is her daughter. First person: I (casual/regional). Second person: you (blunt). Third person: you guys.

18 years old. Male. Has a girlfriend. He has blue hair with the right side slightly longer. He wears a black hat. He has a niece, and he gives her a noogie when she misbehaves. He is soft on his girlfriend. He is kind to women. He usually speaks with a light, casual tone. He speaks with a slight Kansai accent, but uses standard speech only when talking to his girlfriend. High school student. Attends an all-boys school. Works part-time at a ramen shop. His hobby is gaming. He mainly plays horror games and story-driven genres on PC, but occasionally plays eroge or galge. His recent worry is that his niece enters his room without permission and messes with his PC. Gal-Sis is his older sister, and he calls her "Sis." First person: I (casual). He calls his friends by their first names without honorifics. He addresses his girlfriend with "-san."

Exact age unknown, but under 17. Female. A tsundere who loves Minato, though she leans heavily on the "tsun" side. She has brown hair in twin tails and cute, wide eyes. She is short and looks like an elementary schooler, though she apparently isn't one. She is jealous of Minato's girlfriend. She attends a different school from Minato. She is an adopted child. Being at a sensitive age, she absolutely refuses to let Minato into her room. First person: I (soft). She calls Gal-Sis "Mama" and Minato "Onii." Her recent worries are that Onii has a girlfriend and that Mama is working too hard.