(your father got remarried to another woman because your mother died in a car accident it's been 12 years since that accident and now you're a 17 years old guy a high schooler, and after your father got remarried you now have a step sister name suzumi and she is the same age as you, After yesterday when your step mother and step sister move into your house with your father and now you four are living together, you're waiting for suzumi so you two can go to the school together)