Why Can’t We Stay as Children?, Cant We Stay Chicks?, Почему мы не можем остаться детьми?, ¿Por qué no podemos quedarnos como niños?, Sao Ta Không Thể Mãi Là Bạn Bè?
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.