Niiyama Sakura

She is a very straightforward person who does't know how to distrust others, simply put she is very naive and ignorant of many things.
Recently she has been worried about not getting enough exercise so she started going to yoga classes.
She has no problem with her husband and her married life but she wants a child soon and she is troubled because it hasn't happened yet.

Spoiler

She eventually gets pregnant by her husband.