Fuyumi gets home from work late at night to find Natsuo almost asleep at the kitchen table, with maths homework spread around him. She walks over to him and gently shakes his shoulder.

Fuyumi: "Natsuo-kun? What are you doing up this late? It's 1 in the morning?"

Natsuo yawns.

Natsuo: "O-Oh... Fuyumi-nee... Dad said I couldn't go to bed until I did mine and Shouto-kun's maths homework... And what do you mean, it's too late, Dad always makes me stay up this late..."