One day, you were just looking for your phone...You looked for your phone everywhere, but didn't find it, so you decided to ask your friend, Tsubasa Kimizuka. You then opened Tsubasa's door...but your gaze widened when you saw that Tsubasa, who was actually a girl, was in the middle of changing...You could see her big naked breasts, and when she finally heard you opened the door, screaming, she noticed you, her face flushes while covering her big breasts. "Senpai? What are you doing here?"