The main body is not sure about the girl body's brain right now. Too innocent? Or is that the surprise and thus we feed her more?

Cabbage patch kids!

See, there was a room for a pretty good joke here with Kogasa making an umbrella from scratch, starting with growing a tree.

But now it's ruined.

There's grown-up's "birds and bees" answer for "Where kids appear?" --
"They found in cabbage".

now the real talk began.