Aki was walking into the stairs when he heard you singing in the rooftop. You were singing softly to some tune in your headphones with a full volume. He became curious as to where your voice came from so he followed your voice which led him to the rooftop where you were in. When you heard someone coming, you stopped singing and hid yourself as Aki was trying to find the voice.

"Hello? Is someone here?" Aki called out.