Why can't we stay as children?

Why can't we stay as children?

ヒナのままじゃダメですか?
Hina from 5th grade has a secret she can't tell anyone: 3 months ago she started having periods. However, one day her childhood friend Daichi found out about it. These are the endless worries of children starting puberty.
Type: Manga
Status: Finished
Published: ?
Score: N/A
Views: 2,515