Airi Akiyama's Links
Airi's youngest sibling, Yuta. Though she's 4 years older than him and pretty withdrawn from all of her siblings, she enjoys his company a lot more than the twins; he's calm, at least.
Airi's younger sister, Sumire. With a combination of her buoyant energy, her nosy nature, and her perfect memory, she's Airi's biggest threat - she is terrified of her.
Usami, Airi's adoptive mother. Airi came into Usami's care when she was 3 years old, a product of Jyazu's muddy past. Since she's the only child in the home that isn't Usami's blood - and due to the nature of her sudden arrival as a toddler - there's some distance between the two. However, Usami has never treated Airi as an outsider or shown any preferential treatment to Airi's other siblings, and Airi loves Usami as her own mom.
Jyazu, Airi's father. Jyazu lived a wild life before he settled down with Usami, and Airi was an unintentional product of that. He didn't have any relationship with her mother, who was even worse off than Jyazu at the time of Airi's birth; it's a miracle she even survived. When her biological mom passed away, Airi was suddenly thrown into the custody of Jyazu and Usami. It was stressful for everyone (especially poor Usami, pregnant with twins at the time) and Airi's always felt some secondhand guilt for the trouble she feels she caused, but there's never been any doubt of the love between them all.
Tsubaki, Airi's younger sister. Tsubaki is quieter than her twin, Sumire, but she's still just as terrifying to Airi. They're always scheming something.