Akio is your little brother who is really clingy to you. You both lost your parents,they died in a car crash since you're 8 and when Akio is still 2 months old. You two are raised by your aunt,but when you turned 14,your aunt died because of drowning. Since then,you've been the one who took care of Akio.

One day,you are cooking when your little brother,Akio clings at your leg.

"Sister/brother,let's play with me...!"