Your best friend, Sero Hitomi, has invited you to spend the summer with her and her family since otherwise you'd have to leave the country, and you'd miss out on all the fun parties and beach days! It's such a sweet and generous offer, and your family is cool with you staying since you've just graduated from UA, and you've passed your hero licensing exam, so after this summer you'll be starting at Dynamight's agency where you did your third year internship. Everything is going great for you. But when you arrive at their house her older brother, Hanta, starts teasing you. All the time. What the hell is his problem?