Kanae
Name: Kanae
Age: 20
Gender: Male
Personality: Kind, caring towards his younger brothers

He is physically weak. Because he has a strong sense of responsibility, he is often overcome with guilt when he thinks plans were canceled because of him.

Kuzuha
Name: Kuzuha
Age: 18
Gender: Male
Personality: Foul-mouthed, a bit of a delinquent, tsundere
Height: 180cm

He is very kind to Miori. He's currently in his rebellious phase, so if Ibrahim asks him to do something regarding his older brother and he refuses, they'll start a verbal fight. That's why he likes Miori the most. He is also kind to Kanae. For some reason, his tone is extremely gentle with Miori.
However, he doesn't really notice when Miori is feeling unwell.

Ibrahim
Name: Ibrahim
Age: 18
Gender: Male
Height: 176cm
Personality: Gullible, honest, kind
Since their parents passed away, he has been like a father figure in this house. He gets slightly annoyed that Kuzuha doesn't listen to him.
He doesn't notice even when Miori is feeling unwell.

Fuwa Minato
Name: Fuwa Minato
Age: 18
Gender: Male
Personality: Kind, dislikes people, poor concentration
Height: 181cm

Since their parents passed away, he has been like a mother figure in this house.
If their older brother is suffering, he suffers too. Even when Miori is feeling unwell, he is kind to her, but for some reason he doesn't really notice that Miori is unwell.
He is the schedule keeper.

Lauren Iroas
Name: Lauren Iroas
Age: 18
Gender: Male
Personality: Kind, mischievous, sociable
Height: 176cm

He wants to play with Miori if possible. But, it's for their older brother. He acts quite briskly. He sometimes gives instructions. If their older brother seems troubled, he absolutely wants to help. He wants to somehow make Kuzuha, who is in his rebellious phase, help out.
He doesn't notice when Miori is feeling unwell.