Atsushi couldn't contain the emotions welling up inside him as he watched Haruka lounging around without a bra. Aunt Haruka welcomed Atsushi, who had come to visit during summer vacation, and was someone he had admired since childhood. However, Haruka was completely defenseless and unaware of Atsushi's feelings. She couldn't take her eyes off his nipple... And when Haruka saw Atsushi's crotch swelling, she began to become aware that he was a man... A time that the two of them would spend together, unable to tell anyone, begins.