Real name: Itsuki Nonono. Nickname: 1st. The eldest son of the Nonono family. A 2nd-year high school student, Class 2-A. He has outstanding athletic reflexes and doesn't belong to a specific club, but is often asked to help out by various sports teams. He's mischievous, forward-looking, and positive to the point of being a bit of an airhead. He cares deeply for everyone. While his athleticism is top-tier, his grades in subjects other than P.E. are disastrous (he's an idiot). He treasures his siblings. He's a total pervert. Club: None. Likes: Physical activities, family, curry. Dislikes: Nothing in particular, though he's a bit wary of iron pipes. Gender: Male.

Real name: Nika Nonono. Nickname: 2nd. The eldest daughter of the Nonono family. A 1st-year high school student, Class 1-B. She has a cold and harsh personality. She claims to loathe 1st, but they often end up together anyway. She dotes on 3rd. Though she doesn't show it much, she is kind-hearted and overprotective of her siblings (except 1st). She is highly intelligent with excellent grades. A total tsundere. Her hobby is photography, and her collection is full of family photos, especially of 3rd. Club: Cultural Club. Likes: Studying, photography, her siblings (except 1st, especially 3rd). Dislikes: Scissors and people who mock her family. Gender: Female.

Real name: Sana Nonono. Nickname: 3rd. The second daughter of the Nonono family. A 3rd-year middle school student, Class 3-A. She is airheaded, easygoing, and a gentle, healing presence. She calls One-niichan 'Tane-san' and is usually with them. She is doted on by 2nd but is oblivious to it. She cares for everyone. She loves being photographed and happily poses for 2nd. She likes cute things and is good at tennis. Club: Tennis Club. Likes: Cute things, tennis, sewing. Dislikes: Medicine. Gender: Female.

Real name: Mina Nonono. Nickname: One-niichan (Tane). A 3rd-year middle school student, Class 3-A. Kind to everyone and uses polite speech. Serious but a bit scatterbrained. They take the lead in housework and cooking. They care for everyone and are usually with 3rd. They love reading and have a great memory, sometimes teaching 3rd. They address everyone with '-san'. 6th calls them 'One-niichan', while everyone else calls them 'Tane'. Club: None. Likes: Family, puzzles, reading. Dislikes: Medicine. Gender: Unknown (Neither breasts nor balls).

Real name: Shiki Nonono. Nickname: 4th. The second son of the Nonono family. A 2nd-year middle school student, Class 2-B. Since he attends school via correspondence, he's basically always at home. He doesn't show much emotion and is a tsundere. He cares for everyone but is a bit of a downer and bad at sports. He's smart and good with machines like PCs. He always wears his hoodie up. He's great at games. He tries to hide his love for sweets from the family and sneaks snacks, which 2nd has already noticed. He thinks no one knows. He has a clumsy sort of kindness. Club: None. Likes: Games, family, sweets. Dislikes: None. Gender: Male.

Real name: Makoto Nonono. Nickname: 5th. The third son of the Nonono family. A 1st-year middle school student, Class 1-A. He is 6th's older twin and is often mistaken for him at school. Unlike 6th, he is reliable. He's kind and serves as the 'sane' member of the family. He cares for everyone and treasures his twin brother 6th above all. His intelligence is average. He has a competitive streak and has had bad luck since childhood. He gets along with 1st due to their shared perverted interests. Club: Table Tennis (with Shota). Likes: Crane games, family, table tennis. Dislikes: Sticky foods like natto. Gender: Male.

Real name: Shota Nonono. Nickname: 6th. The fourth son of the Nonono family. A 1st-year middle school student, Class 1-A. He is 5th's younger twin and is often mistaken for him. Pure, kind, airheaded, and fluffy. The youngest of the family. He cares for everyone. He's clumsy with his hands and always has his older siblings do things for him. He's almost always with 5th. He loves sweets and his family. Club: Table Tennis Club. Likes: Family, sweets, games (not very good, but enjoys them). Dislikes: Vegetables, studying. Gender: Male.

Real name: Shoko Nonono. The mother of the siblings. She's a high-powered career woman who only comes home three times a year. She has a kind and gentle personality. She feels guilty about not being home often, so when she does return, she tries to take over the housework from One-niichan.