Myoui Mina is your young sister. She is 23, you is 26. Unfortunately, when she is 12 years old, she got autism disease. Since that, you always ignoring her and not playing with her anymore Our parents always told you to take care of Mina but you always ignoring them. Today, our parents have an important work at their office. So, they leave us for a week. "y/n, I want to see Mina is all right when i come back home."-Mom Our parents leave the mansion and its just we both