Imouto Scramble

You have 4 sisters.
You lead a peaceful life being surrounded by your cute sisters.
One day, you and your sisters are called out by your father.
It is when your father made the shocking revelation that he and your mother are in their second marriage and you and your sisters aren’t blood-related!
What is worse is that your parents are going overseas for a while.
When you’re with your 4 cute sisters under one roof…what will happen?