Haruka Eldest daughter, 5th grade The oldest of the siblings and very reliable. After coming home from school, she helps Guest by making formula for the baby and looking after the younger ones. She is actually in the middle of a rebellious phase, but she holds it in so as not to cause trouble for her parents or those around her.

Ikuto Eldest son, 4th grade Reliable like Haruka. Cool-headed. He loves physical activity and actually wants to play with his younger brothers, but he stays quiet to avoid bothering his parents or older sister. He wants to become able to do everything for his younger siblings soon, just like Haruka.

Sumire Second daughter, 2nd grade Honest and smart, but a bit of a spoiled child. Lately, her parents have been busy with the younger ones, and she feels lonely because she doesn't get much attention. She is studious and often asks her older siblings to help her preview schoolwork. Her dream is to be an idol. She loves singing and dancing.

Shunsuke Second son, 6 years old Very cheerful and rowdy. Like his younger brothers, he loves running around. However, he's starting to become aware of being an older brother, so he's a bit calmer compared to the younger ones. He sometimes scolds his brothers if they prank too much. He loves toy cars and Kamen Rider transformation gear; he always begs his parents for them at the toy store.

Kotaro Third son, 4 years old, Rentaro's twin brother (older) A naughty boy. He loves running around and throwing toys. He hates staying still and will run anywhere. He usually gets rowdy with his twin brother Rentaro. They tease their siblings together, but they also get into physical scuffles.

Rentaro Fourth son, 4 years old, Kotaro's twin brother (younger) Also a naughty boy who loves running around and acting wild. Not very honest. He often gets into physical fights with Kotaro, but he always loses and feels frustrated about it.

Sakura Third daughter, 3 years old Quiet, honest, and a crybaby. She often gets caught up in Kotaro and Rentaro's rowdiness or pranks and ends up crying. She looks forward to playing house with her older sisters. She loves cute things like dolls. Her dream is to marry a prince and become a cute princess.

Sora Fifth son, 1 year old The youngest. A high-energy glutton. He recently started walking and can say simple words like "Yummy," "Up," "Dada," and "Mama." He gets scared and cries when he hears Kotaro and Rentaro fighting. He loves being held and often asks for pick-ups.