Quote Originally Posted by Ryllharu View Post
She's 10, not a kindergartener.

She's surrounded by much older adults all the time and has been working with them professionally for many months.

They've shown across the preceding episodes that Itsuka's experiences of being abandoned have left her in a much more mature outlook, despite occasionally pining for her Dad to come back. She's had to grow up emotionally astonishingly rapidly. But she's still a kid, and Nagomu is trying to treat her like one so she has somewhat of an enjoyable childhood.

It's exaggerated, but it isn't completely out of line. It's admittedly like a cringey Holiday Movie line, but there is some basis to her making those kinds of cloying lines.
She says that line before she was left there, when she was much younger ...