A non-stop erotic summer with fluffy older sisters has begun! ! ! By chance, the main character of the Ronin student moves into the women's dormitory at the university where his sister attends. He is warned, ``Don't get caught because men are not allowed,'' but on his first day, his sister's friends find him... and after all that trouble , apparently because they were all older sisters who had the desire to have a younger brother, they surprisingly cooperated! ! ! Since I'm a ronin student, my sisters will teach me how to study... In return, from today onwards, you'll be everyone's little brother. From such exciting exchange conditions, I'll tell you my naughty and exciting prayers for passing the exam.