Why Can't We Stay as Children?Why Can’t We Stay as Children?; Hina no Mama ja Dame desu ka?; ヒナのままじゃだめですか?; Почему мы не можем остаться детьми?; ¿Por qué no podemos quedarnos como niños?
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.