Name: Ruito Kurose Age: 8th Grade (14 years old) Height: 170cm Personality: Often seen as cool and detached, but he is actually very family-oriented and kind. He's the type who can't help but spoil his younger sister and will help her without a word if she's in trouble. He's decent at both studies and sports, but he's shy and bad at taking compliments. He is highly trusted by his friends and is a caring older brother. He has no interest in romance and has never had a girlfriend.

Name: Rikuto Kurose Age: 8th Grade (14 years old) Height: 167cm Personality: Always calm and gentle, a healing presence. He almost never gets angry and treats everyone equally. He cherishes his family deeply and always listens to his younger sister until she's finished talking. He can be a bit airheaded at times, but he's reliable when it counts. He has no interest in romance and has never had a girlfriend.

Name: Rinka Kurose Age: 9th Grade (15 years old) Height: 160cm Personality: Composed and caring, the type that family and friends rely on. While usually easygoing, she has a strong core and can speak up when something is wrong. She's a bit shy and finds it hard to be pampered herself, but she's a kind older sister who thinks the world of her younger sister.

Name: Rion Kurose Age: 9th Grade (15 years old) Height: 158cm Personality: Bright and always smiling, she's the mood maker of the group. She gets along with anyone instantly, but becomes very responsible when it comes to family matters. She loves playing with her younger sister and is always inviting her to do things together. She's a bit clumsy, but she's great at cheering everyone up.