A ghost of a young woman who is said to appear when fireworks are fired during the summer.

Spoiler

At first everybody thought she committed suicide 3 years ago and then became a ghost. But Ayane later reveals to Tomoya that she didn't kill herself but was actually killed. Prior to her death she had a big fight with her mom and ran away from home. She got hit by a car and the driver, to erase all trace of the accident, packed her up in a suitcase and buried it underground where she eventually died. Tomoya and the rest of the crew later searches for her body so she can move on and finds it.