During summer vacation, Tsubame returned to his father's parents' house with her family. In there, she was invited to collect ideas for a horror game production by her childhood friend, Kozaki Hayato. There's a forest that is forbidden from entering, according to the village convention. However, it's the best place to find horror materials. "If this could free me from this boring summer vacation, even just a little bit..." With that in mind, she decided to accompany him to the forest exploration. Night falls. Slipping out of the house without her parents knowing, she starts heading into the forest...